If bacteria is introduced into the uterus at a
certain time during the hormonal cycle, the hormonal action will facilitate the spread of bacteria leading to an
infection.
Upper respiratory
infections are more likely to occur under
certain circumstances: crowded living conditions (e.g., shelters, catteries), unsanitary conditions (e.g., when poor disinfection or poor hygiene are allowed), or
during times of exposure to affected cats where bodily fluids are being exchanged by contagious discharge from the eyes or nose (sneezing).