Cryptosporidiosis in dairy calves

The protozoan parasite Cryptosporidium parvum is currently the pathogen most commonly found in young calves with diarrhoea. It is present in most dairy herds, and the disease it causes (cryptosporidiosis) can be a challenge even in herds with excellent calf management. Very few cryptosporidia are needed to make a calf sick, while infected calves shed millions of parasites in their faeces.

One part of the project focuses on basic research on the parasite’s genome. Diarrhoeic calves in four different regions of the country are clinically examined and sampled, and the DNA of C. parvum is mapped (whole‑genome sequencing). Later studies will investigate the function of selected genes and search for new potential targets for future medicines or disinfectants.

In the second part of the project, we gather practical knowledge from farms with previous or recent experience of the disease through group interviews with animal owners and farm managers, with the aim of improving advisory services on cryptosporidiosis. We are also conducting a survey among veterinarians about which measures they consider most important for controlling the disease problems.