What environmental conditions predispose animals to infections by Dermatophilus congolensis?

Dermatophilus congolensis is a bacterium that is the causative agent of dermatophilosis, a skin infection primarily seen in livestock, particularly cattle and sheep. One of the main environmental factors that contribute to the infection by this organism is prolonged wetting by rain.

When animals are exposed to excessive moisture, especially when they remain wet for extended periods, the skin barrier is compromised. This condition creates an optimal environment for the bacteria to penetrate and cause infection. Moist environments can weaken the skin, leading to lesions that allow the bacterium to enter and thrive. Additionally, Dermatophilus congolensis is sensitive to dry conditions, as they require certain levels of moisture for spore formation and subsequent infection.

By recognizing the significant impact of prolonged wetting on the vulnerability of animals to infections from Dermatophilus congolensis, it becomes clear why this environmental condition is particularly relevant in the context of the disease.