Bovine cysticercosis prevalence: 6.46% in 604 cattle
Bovine cysticercosis prevalence reached 6.46 percent across 604 cattle inspected at two abattoirs in western Ethiopia. Cattle slaughtered at the rural-district abattoir were about three times as likely to be infected as cattle at the capital-town abattoir, and 35.8 percent of the recovered cysts were still viable. Among 200 residents, 23 percent reported a lifetime tapeworm infection and 55.5 percent still ate raw or undercooked beef.
Why bovine cysticercosis prevalence matters to both veterinarians and clinicians
Bovine cysticercosis is a zoonotic disease: the larval stage of Taenia saginata, the beef tapeworm, lodged in the muscle of cattle. The adult worm lives in the human intestine and causes taeniasis. These are one parasite seen from two sides, and that is why a stand-alone figure for bovine cysticercosis prevalence rarely explains what is happening in a district.
The transmission cycle is short and unglamorous. A person carrying the adult tapeworm passes eggs in stool. Those eggs reach pasture, feed or water. Cattle swallow them and cysts develop in muscle, most often in the tongue, the masseter muscle and the triceps muscle. Someone eats that beef raw or undercooked, and the cycle restarts. Every control lever sits on one of those four steps.
The costs land on two budgets. Farmers and slaughterhouses absorb carcass condemnation and downgrading. Health services absorb the clinical burden, which runs from nausea, abdominal discomfort and epigastric pain to appetite loss, weight loss and, in heavy infections, intestinal blockage. Infected cattle rarely look sick, so the problem stays invisible until an inspector finds it.
The same parasite also carries a food safety cost that is easy to overlook. A carcass with detectable cysts is either rejected or discounted, so the loss is real money at the abattoir rather than a theoretical public health figure.
How the study was designed and what was measured
The work paired an abattoir survey of slaughtered cattle with a community questionnaire in two districts of a zone in western Ethiopia. A One Health design of this kind examines the intermediate host, the definitive host and the environmental risk factors in a single pass instead of three separate studies.
| Parameter | Detail |
| Design | Cross-sectional One Health study combining abattoir inspection with a community questionnaire |
| Period | January 2025 to November 2025 |
| Setting | Two districts in a zone of western Ethiopia |
| Cattle inspected | 604 in total, 384 at the capital-town abattoir and 220 at the rural-district abattoir |
| Cattle sampling | Systematic random sampling, every third animal presented for slaughter |
| Organs incised | Tongue, masseter muscle, heart, triceps muscle, liver and kidneys |
| Cyst classification | Viable if translucent and fluid filled, non-viable if calcified or caseous |
| Viability confirmation | Incubation in 30 percent ox bile in normal saline at 37 degrees Celsius for 1 to 2 hours, with scolex evagination confirming viability |
| Human respondents | 200 adults, 100 per district, selected by simple random sampling |
| Human case definition | Self-reported lifetime history of tapeworm infection |
| Questionnaire handling | Pre-tested on 20 people, then administered in the local language and translated back into English |
| Statistical analysis | Logistic regression, collinearity screening by variance inflation factor, backward elimination, Hosmer-Lemeshow fit test and ROC curve |
Sample size followed the burden the team expected to find. Planning assumed a bovine cysticercosis prevalence of 6.5 percent at a confidence level of 95 percent and a precision of 5 percent, which gave a minimum of 94 animals. The final figure of 604 was chosen to support subgroup analysis of several risk factors across two abattoirs, which made the comparison between sites possible.
The inspection protocol matters as much as the number it produced. Post-mortem examination followed routine national meat inspection practice and relied on visual inspection and palpation of a fixed list of sites, a method that misses light infections. Human prevalence came from what people remembered rather than from stool examination. Investigators asked whether a respondent had ever been diagnosed with or experienced a tapeworm infection, then probed symptoms such as passing proglottid segments, abdominal discomfort, nausea, appetite loss and weight loss. Associations were tested by logistic regression, and only factors surviving multivariable modeling were kept.
Bovine cysticercosis prevalence in cattle at two abattoirs
Prevalence was moderate overall and sharply uneven between the two sites.
| Abattoir | Carcasses inspected | Positive carcasses | Prevalence, % (95% CI) |
| Capital-town abattoir | 384 | 14 | 3.64 (2.18 to 6.03) |
| Rural-district abattoir | 220 | 25 | 11.36 (7.82 to 16.24) |
| Both abattoirs | 604 | 39 | 6.46 (4.76 to 8.71) |
Bovine cysticercosis prevalence across the two abattoirs combined was 6.46 percent, or 39 of 604 carcasses. The confidence interval of 4.76 to 8.71 percent is wide enough that the true figure could sit near either edge of that band, so read it as an order of magnitude rather than a precise rate.
The gap between the two sites is the more useful signal. At 11.36 percent, the rural-district abattoir ran at roughly three times the rate recorded at the capital-town abattoir, which suggests that what differs between the two catchments matters more than anything about the individual animals.
Where the cysts were found and how many were viable
Detection was not spread evenly across the carcass, and the organ with the most cysts was not the organ with the most infectious cysts.
| Organ inspected | Organs examined | Positive organs | Detection rate, % | Viable cysts |
| Triceps muscle | 604 | 22 | 3.64 | 6 of 22 (27.3) |
| Tongue | 604 | 11 | 1.82 | 6 of 11 (54.5) |
| Masseter muscle | 604 | 9 | 1.49 | 3 of 9 (33.3) |
| Heart | 604 | 8 | 1.32 | 3 of 8 (37.5) |
| Liver | 604 | 2 | 0.33 | 1 of 2 (50.0) |
| Kidney | 604 | 1 | 0.17 | 0 of 1 (0.0) |
The triceps muscle carried the largest share of cysts at a 3.64 percent detection rate, ahead of the tongue at 1.82 percent and the masseter muscle at 1.49 percent. Heart, liver and kidney followed at much lower rates. In total, 53 cysts were recovered from the 39 positive carcasses, which means several animals carried more than one cyst and some had cysts in more than one organ.
Viability tells a different story from detection. Of the 53 cysts recovered, 19 were viable, a share of 35.8 percent, and 34 were non-viable. Only viable cysts can infect a person who eats the meat, so that third of the total is what keeps the cycle running. Non-viable cysts are usually calcified or caseous, and their frequency here is consistent with older animals, host immune responses or a long gap between infection and slaughter.
Risk factors for bovine cysticercosis in cattle
| Risk factor | Category | Cattle examined | Positive, % | Odds ratio (95% CI) | p value |
| Abattoir location | Capital town | 384 | 3.65 | Reference | Reference |
| Abattoir location | Rural district | 220 | 11.36 | 3.39 (1.72 to 6.67) | 0.001 |
| Sex | Male | 549 | 6.19 | Reference | Reference |
| Sex | Female | 55 | 9.09 | 1.46 (0.57 to 4.05) | 0.408 |
| Breed | Local | 588 | 6.30 | Reference | Reference |
| Breed | Crossbred | 16 | 12.50 | 1.89 (0.13 to 8.06) | 0.973 |
| Age | Under 4 years | 102 | 5.88 | Reference | Reference |
| Age | 4 to 8 years | 411 | 6.08 | 1.03 (0.39 to 2.42) | 0.939 |
| Age | Over 8 years | 91 | 8.79 | 1.49 (0.65 to 3.42) | 0.348 |
| Body condition | Poor | 37 | 13.51 | 1.85 (0.97 to 7.75) | 0.058 |
| Body condition | Medium | 389 | 5.40 | 0.74 (0.67 to 2.82) | 0.377 |
| Body condition | Good | 178 | 7.30 | Reference | Reference |
Only one factor survived into the final model. Cattle slaughtered at the rural-district abattoir had 3.39 times the odds of infection compared with cattle at the capital-town abattoir, with a confidence interval of 1.72 to 6.67 and a p value of 0.001. Age, sex, breed, body condition and district of origin all fell away, and the model built on the single remaining predictor had acceptable discrimination at an area under the ROC curve of 0.728.
That result is less strange than it looks. Where cattle graze communal pasture, exposure to tapeworm eggs is spread evenly across the herd, so individual traits such as age or body condition stop predicting anything. What predicts infection is the pasture the animal uses, and that is a property of the catchment rather than of the animal.
Poor body condition came closest to mattering on its own, at 13.51 percent positive against 7.30 percent for good condition, but the confidence interval crossed 1 and the factor did not survive multivariable modeling. With only 37 poorly conditioned animals in the sample, that comparison is underpowered.
Human Taenia saginata taeniasis prevalence and its risk factors
| Risk factor | Category | Respondents | Positive, % | Odds ratio (95% CI) | p value |
| Age | Under 18 years | 31 | 6.4 | Reference | Reference |
| Age | 18 to 35 years | 78 | 24.3 | 4.02 (1.24 to 17.2) | 0.041 |
| Age | 36 to 50 years | 59 | 28.8 | 4.68 (1.34 to 22.2) | 0.019 |
| Age | Over 50 years | 32 | 25.0 | 4.05 (0.82 to 21.6) | 0.062 |
| Raw or undercooked beef habit | Yes | 111 | 39.6 | 16.91 (2.84 to 24.31) | 0.001 |
| Raw or undercooked beef habit | No | 89 | 2.2 | Reference | Reference |
| Water source | Piped water | 153 | 22.2 | Reference | Reference |
| Water source | Rivers or ponds | 20 | 40.0 | 3.32 (1.22 to 5.49) | 0.004 |
| Water source | Well water | 27 | 14.8 | 0.64 (0.59 to 3.48) | 0.428 |
Of the 200 residents interviewed, 46 reported having been infected by Taenia saginata taeniasis at least once in their life, a prevalence of 23 percent with a confidence interval of 17.5 to 29.4 percent. That is a self-reported lifetime figure rather than a point-in-time laboratory result, and the two measure different things.
Three factors stayed in the final multivariable model. Adults aged 18 to 35 years and 36 to 50 years had roughly four times the odds of reporting infection compared with people under 18, which points to the most economically and socially active age bands rather than to children. A reported habit of eating raw or undercooked beef raised the odds by a factor of about 17, with a confidence interval of 2.84 to 24.31. Using rivers or ponds as a water source was associated with 3.32 times the odds of reported infection compared with piped water.
Education level and occupation dropped out, and that omission is informative. In these districts, risky eating and unsafe water cut across social strata, so a program that targets households with less schooling would miss most of the exposure.
Model fit was reasonable, with a Hosmer-Lemeshow p value of 0.858 and an area under the ROC curve of 0.70. Collinearity screening removed the frequency of raw beef consumption because it tracked the simple yes or no habit question too closely to keep both.
Knowledge, attitude and practice: knowing is not the same as stopping
| Indicator | Finding |
| Aware of tapeworm infection | 90 % (180 of 200) |
| Believe raw meat is a risk factor | 78 % (156 of 200) |
| Aware and also believe raw meat is a risk | 78 % |
| Believe raw meat is risky but still eat it | 46 % |
| Believe raw meat is risky and avoid eating it | 32 % |
| Eat raw or undercooked beef | 55.5 % (111 of 200) |
| Eat it only occasionally | 52.3 % of those eaters |
| Buy the meat from a butcher shop | 71.2 % of those eaters |
| Use an uncovered pit latrine | 85 % (170 of 200) |
| Infected respondents choosing modern medicine | 71.7 % of those who stated a preference |
The knowledge score looks strong until it is set against behaviour. Nine in ten respondents had heard of tapeworm infection and 78 percent named raw meat consumption as a risk factor, yet 55.5 percent of the whole sample still ate raw or undercooked beef. Among the respondents who accepted that raw meat is risky, 46 percent ate it anyway and only 32 percent avoided it.
Practices on the environmental side of the cycle were weaker still. Eighty-five percent of respondents used an uncovered pit latrine, which leaves the route from human stool to grazing land, feed and water wide open. Only 6.5 percent used a covered latrine and 8.5 percent had a flush toilet.
One result points the other way. Of the infected respondents who expressed a treatment preference, 71.7 percent chose or had chosen modern medicine, while 17.4 percent chose traditional treatment. Demand for clinical care already exists, which makes routine treatment a practical entry point rather than a behaviour to be created from scratch.
How the findings compare with other Ethiopian surveys
| Setting | Reported prevalence in cattle, % |
| This study, western Ethiopia | 6.46 |
| Comparable regional surveys | 6.5 to 6.7 |
| High-burden abattoirs in the south and east | 26.3 to 27.3 |
| Lower-burden municipal abattoirs | 2.8 to 4.2 |
| National range across abattoir surveys | 2.8 to 69.5 |
Bovine cysticercosis prevalence in this setting sits in the middle of a very wide national picture. Reported values from abattoir surveys across the country run from about 2.8 percent to as high as 69.5 percent, and the figure here matches two earlier regional studies at 6.5 and 6.7 percent. Studies from southern and eastern abattoirs have reported roughly ten times the rate found here, while municipal abattoirs in the largest cities have reported less than half of it.
The human side shows the same spread. Self-reported taeniasis in this survey, at 23 percent, is close to values reported from rural communities in the north and northwest at around 26 to 30 percent, and well above surveys in some highland and central areas that found 1.5 to 2.4 percent. Towns in other regions have reported 44 to 69.5 percent on the same self-reported basis.
The variation across studies is not noise. Grazing systems, urbanization, sanitation coverage, how much raw meat is eaten, how hard inspectors look and the study period all move the number, which is why a regional rate cannot be transplanted to a different catchment.
Four counterintuitive findings
The triceps muscle outranked both classic inspection sites. Standard practice concentrates on the tongue and the masseter muscle, the historic predilection sites. In this survey the triceps carried twice as many cysts as the tongue and more than twice as many as the masseter, so the muscle with the most cysts can be the one that gets the least attention.
Detection and infectivity point in different directions. The triceps had the most cysts but the lowest viability ratio among the major sites, at 27.3 percent. The tongue had fewer cysts but the highest viability, at 54.5 percent. Since the tongue is a common component of raw beef dishes, the organ with fewer cysts is the one most likely to pass infection on.
Awareness is not the binding constraint. Ninety percent of respondents knew about tapeworm infection and 78 percent could name raw meat as the risk, yet more than half the sample still ate raw or undercooked beef. Education level did not survive the human multivariable model, which is a strong hint that information campaigns are addressing a gap that is not the main one.
Two thirds of the cysts were already dead. A 6.46 percent detection rate sounds like an active problem until you notice that only 35.8 percent of the cysts were viable. Both numbers matter, and they matter for different reasons: the detection rate sets the economic loss at the abattoir, while the viability rate sets the ongoing transmission pressure.
What these numbers mean for control and treatment programs
- Treat the rural catchment as the priority, not the species. Location explained cattle infection and animal traits did not, so effort belongs on grazing land, water points and the households around them.
- Add the triceps to routine inspection punch lists. The current site list systematically under-samples the most affected muscle, so prevalence measured by inspection is a floor.
- Stop treating the tongue as low priority once it is found positive. Its high viability ratio makes it the most consequential positive organ for a raw beef eating culture.
- Pair awareness campaigns with a change in the physical environment. Knowledge is already high, so put the money into covered latrines and safe water in the rural catchment instead.
- Reach the working-age adults, not just schoolchildren. The odds of reported infection peaked in the 18 to 50 age bands.
- Use routine human treatment as a delivery channel. Most infected respondents already preferred modern medicine, so deworming can ride on existing clinical demand.
- Measure viability, not just presence. Cyst counts alone overstate transmission risk by a factor of roughly three.
- Repeat the survey after any intervention. Because inspection sensitivity is low, only a repeated measurement on the same protocol can show whether a program moved the rate.
Limitations of the evidence
Prevalence in cattle rests on routine meat inspection, a method with well-documented low sensitivity, particularly for lightly infected carcasses. The figure of 6.46 percent is therefore likely to understate the true burden, and the same applies to the comparison between the two abattoirs. Human prevalence depends on memory: respondents reported whether they had ever been infected, which can understate infection in people whose symptoms were mild and overstate it in people who attributed digestive complaints to a worm. No molecular testing was performed, so the parasite species in cattle and in people was not confirmed by sequence.
Some point estimates do not reconcile with each other. The tabulated final model for the raw beef habit gives an odds ratio of 16.91, while the same effect is described elsewhere as roughly fourfold, and the ratio for rivers and ponds appears as both 2.32 and 3.32 depending on the model stage reported. The tables are used here because they are internally consistent with the group counts, but a reader should lean on the confidence intervals and on the direction of each effect rather than on any single point estimate. One cell in the anatomical table was blank for kidney viability, and it is read here as zero of one.
The study also had no temporal dimension beyond a single survey window, and it covered two districts, so it cannot speak for other zones. Predictions from a model with a single predictor should be read carefully, and goodness-of-fit testing means little when a model holds only one predictor.
Bottom line
Bovine cysticercosis prevalence of 6.46 percent in cattle is a moderate figure that hides a threefold difference between two abattoirs in the same zone that draw on very different grazing catchments. On the human side, 23 percent reported lifetime infection, and the strongest driver was not ignorance but the habit of eating raw or undercooked beef, which raised the odds about 17 fold. The single most actionable finding is that only 35.8 percent of cysts were viable, so control programs that target every detected cyst will spend most of their budget on cysts that can no longer infect anyone. Aim the money at the rural catchment, the tongue, covered latrines and routine human treatment.
FAQ
What is bovine cysticercosis and how does it spread
Bovine cysticercosis is the larval stage of the beef tapeworm Taenia saginata, developing as fluid filled cysts in the muscle of cattle. Cattle acquire it by swallowing tapeworm eggs that reach pasture, feed or water from the stool of an infected person. The cysts then pass to people who eat that beef raw or undercooked, which restarts the cycle.
How common is bovine cysticercosis in cattle slaughtered in western Ethiopia
Bovine cysticercosis prevalence was 6.46 percent across 604 carcasses inspected at two abattoirs, with a confidence interval of 4.76 to 8.71 percent. That average hides a wide split, because the capital-town abattoir recorded 3.64 percent while the rural-district abattoir recorded 11.36 percent. Read the combined number as a district average rather than as one abattoir’s risk.
Which muscles are most often affected by Cysticercus bovis cysts
The triceps muscle carried the highest detection rate at 3.64 percent, ahead of the tongue at 1.82 percent and the masseter muscle at 1.49 percent. Heart, liver and kidney followed at 1.32, 0.33 and 0.17 percent respectively. The order matters because routine inspection emphasizes the tongue and masseter, so the most affected muscle is often the least examined.
What share of Cysticercus bovis cysts are viable and does that matter
Of 53 cysts recovered from 39 infected carcasses, 19 were viable, a share of 35.8 percent, while 34 were non-viable. Only viable cysts can infect a person who eats the meat, so that one third of the total is what keeps transmission running. Viability was highest in the tongue at 54.5 percent, which is also the organ most often eaten raw.
Why does bovine cysticercosis prevalence differ between abattoirs
The rural-district abattoir drew on a mostly rural catchment where cattle graze communal pasture, so those animals met tapeworm eggs far more often. The capital-town abattoir served a more urbanized catchment with different grazing and sanitation conditions. Cattle at the rural site had about 3.4 times the odds of infection, and that gap was statistically significant.
How is bovine cysticercosis detected during meat inspection
Inspectors incise six standard sites, including the tongue and masseter, then classify each suspected cyst by eye. Cysts that look translucent and fluid filled are called viable, while calcified or caseous ones are called non-viable. Suspect cysts were confirmed by incubation in 30 percent ox bile in saline at 37 degrees Celsius for 1 to 2 hours, where a protruding scolex confirmed viability.
How common is Taenia saginata taeniasis in people in the study districts
Among 200 residents, 46 people, or 23 percent, reported a tapeworm infection at some point in their life, with a confidence interval of 17.5 to 29.4 percent. That figure rests on self-reported history rather than stool testing, so it can miss people who were infected without noticing symptoms. Use it as a signal of community exposure rather than as a laboratory confirmed rate.
Which risk factors drive human Taenia saginata taeniasis
A habit of eating raw or undercooked beef was the strongest factor, raising the odds of reported infection by roughly 17 fold. Age mattered too, because adults aged 18 to 50 were about four times as likely to report infection as people under 18. Using rivers or ponds as a water source was also linked to higher odds, at 3.32 times those of piped water.
Why do people keep eating raw beef when they already know the risk
Awareness and behaviour are not the same thing, and this survey shows the distance between them. Ninety percent of respondents knew about tapeworm infection and 78 percent named raw meat as a risk, yet 46 percent of those who accepted the risk still ate raw beef. Deeply held food traditions such as kitfo and kurt override a warning that carries no immediate visible cost.
Does poor sanitation really matter for tapeworm transmission
Yes, and it is the step that closes the loop. In this survey, 85 percent of respondents used an uncovered pit latrine, which lets eggs from infected stool reach grazing land, feed and water, while only 6.5 percent had a covered latrine. That is what keeps re-infecting cattle even when human treatment and meat inspection are working well.
How can bovine cysticercosis prevalence be reduced in practice
Work all four transmission steps at once, because blocking three of them leaves the cycle intact. Priority actions are covered latrines and safe water in the rural catchment, inspection that includes the triceps muscle, routine deworming for working-age adults, and hygienic slaughter and meat handling. Because inspection is insensitive, repeat the measurement afterwards to prove the rate moved.
What are the main limitations of abattoir based prevalence estimates
Meat inspection has low sensitivity, especially for lightly infected carcasses, so the true burden is probably higher than the reported rate. The human figure relies on recall, which can bias in either direction, and no molecular testing confirmed the parasite species in cattle or in people. The survey also covered two districts in one period, so it cannot be generalized to other zones.
