1 You only have head lice if you can find a living, moving louse (not a nit) on the scalp. 2  Anybody can get head lice. 3  Head lice infections are caught from close family and friends in the home and community, not from the school. 4  Spread of head lice requires direct head to head contact.
Leptospirosis, also called Weil's disease, is a bacteria that many rats carry without showing symptoms of infection. Humans become infected when contaminated rat urine or feces comes in contact with mucous membranes.hile they can carry and spread the disease, fleas on the rat are more often to blame. Fleas spread plague between animals and from animals to humans. Rats will die if they become infected with plague. Humans can also die without treatment, but antibiotics can are usually effective.
Zoonotic diseases may be spread in different ways. Tapeworms can often spread to humans when people eat the infected meat of cattle, and swine. Other diseases are transferred by insect vectors, often blood-feeding insects that carry the cause of the disease from one animal to another.auses and symptoms. The following is a partial list of animals and the diseases that they may carry. Not all animal carriers are listed, nor are all the diseases that the various species may carry. 1  Bats are important rabies carriers, and also carry several other viral diseases that can affect humans.