Transmission studies with the contagious equine metritis bacterium in albino Swiss mice.

The research looks into how the bacterium responsible for contagious equine metritis (CEM) – a venereal disease in horses – is experimentally transmitted in albino Swiss mice. The study identified that female mice were more susceptible to infection than male mice, with evidence of only one probable case of sexual transmission of the disease. Infected female mice, however, could still conceive and give birth to normal offspring.

Transmission Study of CEM Bacterium

• The research primarily focused on understanding the transmission dynamics of the bacterium causing contagious equine metritis (CEM), a venereal disease commonly found in horses, in a different species, albino Swiss mice.
• The researchers infected both male and female albino Swiss mice with the CEM bacterium and monitored the progress and effects of the disease.

Infection and Susceptibility

• The results indicated a clear difference in susceptibility between genders. The majority of female mice got infected with the bacterium, whereas it was recovered from only a limited number of male mice after the challenge affect.
• Interestingly, even though the mice were infected with the disease, there were no clinical symptoms observed in any of the test subjects. This suggests that while the mice can harbor the bacterium, they may not exhibit the same symptomatic response as horses.

Venereal Transmission of CEM Bacterium

• The study revealed just one instance of a probable venereal (sexual) transmission of the CEM bacterium. Researchers mentioned this as a “presumptive” case, indicating that it could not be definitively confirmed if the transmission was indeed sexual.

Reproduction in Infected Female Mice

• While investigating the effects of the bacterium on the reproductive capabilities of the infected mice, it was found that one third of the infected female mice were able to conceive and give birth to normal litters.
• This finding is significant as it suggests that despite being infected, female mice did not exhibit any reproductive dysfunction. The infection did not seem to impact their fertility or the health of their offspring.