Survey on equine cryptosporidiosis in Poland and the possibility of zoonotic transmission.

The research paper surveys the prevalence of Cryptosporidium infection in recreational riding horses and human beings in Poland, with an emphasis on the potential for zoonotic transmission of the infection.

Study Methodology

• The study targeted 106 horses used for recreational riding, raised in 4 different locations across western Poland. The horses’ faecal specimens were collected for examination.
• The samples were screened microscopically for Cryptosporidium oocysts using a modified Ziehl-Neelsen staining procedure.
• Additionally, stool samples of six humans who’ve had either constant or sporadic contact with the horses were also collected.
• An Enzyme Immunoassay (EIA) was used to detect the presence of coproantigen in these human stool samples and randomly selected horse faecal samples.

Findings

• The overall Cryptosporidium infection rate in horses as determined by microscopic examination was 9.4%. This is reportedly the first observation of cryptosporidial infection amongst horses in Poland.
• The infection was only identified in adult horses from two of the four farms under study, and the intensity of the equine cryptosporidial infection was generally low. No visible symptoms were observed in the infected horses.
• In samples subjected to EIA, both Cryptosporidium oocysts and coproantigen were found in five samples. However, in seven samples only the parasite coproantigen was detected.
• Morphometric analysis of the oocysts indicated that the horses were likely infected by C. parvum, a type of Cryptosporidium.
• Of the three tested humans, one who only had sporadic contact with horses was identified with cryptosporidial infection.

Implications

• These findings underscore the fact that there is a potential for zoonotic transmission of Cryptosporidium infection from horses to humans.
• The real infection rate may be higher than calculated in this study, given that some samples showed presence of the parasite coproantigen but not the oocysts.
• These results highlight a health concern not only for those in frequent contact with horses, but also for individuals who have sporadic contact.
• Given these findings, preventive measures and further large-scale health surveillance would be beneficial for humans having contact with horses in any form, to better understand the potential risks and control the transmission of the disease.