Psittacine Beak and Feather Disease (PBFD) is a viral disease that affects many birds including parrots. It attacks the feathers and beaks and causes infections that attack the immune system of its host.
The cholera bacterium is a bacterium that causes cholera. This species of bacteria lives in contaminated natural reservoirs (such as lakes, rivers and wells). It infects the intestines of people who drink water contaminated with human feces. It causes recurrent and aggressive diarrhea. But disappeared after three days. The ways to protect yourself are to drink uncontaminated water, wash your hands frequently and use chemical toilets or bury feces if no toilet is available; do not defecate in water and cook food thoroughly.
The marine vase, enters in competition between other species in benthic environment. It takes the place of other native invertebrate species and causes a reduction in animal diversity in the environment in which it is newly installed, because of its high capacity to reproduce.
^ abcZimmerman, H. G. South Africa. In: Macdonald, I. A. W., et al. Invasive Alien Species in Southern Africa: National Reports & Directory of Resources. Global Invasive Species Programme. 2002. pg 45.