Experimental Infection in Mice with Cryptosporidium Isolated from Humans

Area of Science:

• Veterinary Parasitology
• Infectious Diseases
• Microbiology

Background:

• Cryptosporidium is a protozoan parasite affecting the gastrointestinal and respiratory tracts of various hosts.
• Human-derived Cryptosporidium species pose a significant public health concern.
• Understanding host-parasite interactions is crucial for controlling transmission.

Purpose of the Study:

• To experimentally infect conventional mice with three human-derived Cryptosporidium species.
• To assess the infectivity and shedding patterns of Cryptosporidium canis, Cryptosporidium parvum, and Cryptosporidium ryanae in mice.
• To evaluate the potential of mice as a reservoir for Cryptosporidium transmission.

Main Methods:

• Oral inoculation of 10-day-old mice with C. canis, C. parvum, or C. ryanae.
• Fecal sample analysis for oocyst detection starting four days post-infection.
• Detection of infection using rapid immunochromatographic tests up to 40 days post-infection.
• Monitoring of dam mice for indirect transmission.

Main Results:

• Successful infection was achieved with all three Cryptosporidium species, albeit at low levels.
• Oocysts were detected in feces from four days post-infection.
• Infection was confirmed via immunochromatographic tests at 40 days post-infection.
• Dam mice became infected by day 17, suggesting indirect transmission.

Conclusions:

• Mice can be experimentally infected with human-derived Cryptosporidium species.
• Mice may serve as a potential source for Cryptosporidium transmission to susceptible hosts, including humans.
• Further research is needed to elucidate the role of rodents in Cryptosporidium epidemiology.