First report on seroprevalence of Toxoplasma gondii infection in zoo animals in Algeria.

Overview

• This study is the first to examine the presence of antibodies against Toxoplasma gondii, a widespread parasite, in various zoo animal species in Algeria.
• The research measured how many animals had evidence of previous infection, indicating exposure to the parasite.

Introduction to Toxoplasma gondii and Research Purpose

• Toxoplasma gondii is a protozoan parasite that infects nearly all warm-blooded animals, including humans, often with significant health implications.
• The parasite is polyxenic, meaning it can infect multiple species rather than having a single host.
• Before this study, there had been no research reporting the infection rates of T. gondii among zoo animals in Algeria.
• The main purpose was to evaluate the seroprevalence (i.e., the proportion of animals that had antibodies indicating past or present infection) in various captive animal species at an Algerian zoo.

Study Design and Sample Collection

• The study analyzed serum samples from a total of 54 individual animals, spanning eight species:
• Australian goats (Capra hircus): 30 samples
• Bulls (Bos taurus): 4 samples
• Dromedary (Camelus dromedarius): 1 sample
• Cuffed sheep (Ammotragus lervia): 3 samples
• Donkeys (Equus asinus): 7 samples
• Pony (Equus ferus): 1 sample
• Bearded horses (Equus ferus caballus): 4 samples
• Rabbits (Oryctolagus cuniculus): 4 samples
• Sampling was designed to cover a range of different species typically found in a zoo environment.

Methodology

• Detection of Toxoplasma gondii antibodies was done with an indirect ELISA test, using the ID Screen® Toxoplasmosis Indirect Multispecies ELISA kit.
• The ELISA (enzyme-linked immunosorbent assay) measures the presence of specific antibodies in a blood serum sample, which indicate exposure to the parasite.
• Antibody detection suggests either current infection or previous exposure that triggered an immune response.

Results

• Overall, 8 out of 54 animals tested (14.8%) were seropositive for T. gondii antibodies, meaning they had been exposed to the parasite.
• Breaking down by sex, 17.9% of males (5/28) and 11.5% of females (3/26) were seropositive.
• Seroprevalence varied significantly between species:
• Capra hircus (goats): 6.7% positivity
• Bos taurus (bulls): 50% positivity (2 out of 4)
• Equus ferus caballus (bearded horses): 25% positivity (1 out of 4)
• Oryctolagus cuniculus (rabbits): 75% positivity (3 out of 4)
• No antibodies were found in Camelus dromedarius (dromedary), Ammotragus lervia (cuffed sheep), Equus asinus (donkeys), or Equus ferus (pony).

Significance and Implications

• This study is the first to provide evidence of T. gondii infection among zoo animals in Algeria, filling an important gap in local epidemiological knowledge.
• Findings highlight that multiple species in a captive environment can be exposed to T. gondii, with some species such as rabbits and bulls showing particularly high seroprevalence.
• The presence of infection in zoo animals raises awareness about potential health risks for animals themselves and possible zoonotic transmission to humans who may interact with or manage these animals.
• The data can contribute to developing management and preventive strategies to reduce infection risks within zoological parks in Algeria.
• The variability between species suggests specific behaviors, diets, or environmental factors might influence the risk of infection, which could be a focus for future research.

Conclusion

• This pioneering seroepidemiological survey provides baseline data on T. gondii exposure in Algerian zoo animals.
• It demonstrates the presence of the parasite in several species, underscoring the need for ongoing monitoring and health management in zoos.