The strong membrane that forms around an ovum as it develops in the ovary. The membrane remains in place during the egg’s travel through the fallopian tube. To fertilize the egg, a sperm must penetrate the thinning zona pellucida. If fertilization takes place, the zona pellucida disappears, to permit implantation in the uterus.
- Zone Diet
The Zone diet is a weight loss plan based upon the idea that the right ratio of carbohydrates to proteins and fats can control levels of insulin in the bloodstream. Too much of the hormone, according to the diet’s developer Barry Sears, PhD, can increase fat storage and inflammation in the body. In his book […]
An infection that is known in nature to infect both humans and lower vertebrate animals.
anthrax ascariasis brucellosis plague echinococcosis Lassa fever listeriosis Lyme disease monkeypox psittacosis rabies salmonellosis trichinosis toxoplasmosis typhus and West Nile fever Zoonoses may appear suddenly and be relatively virulent, as illustrated by HIV which ignited the AIDS epidemic and the coronavirus responsible for the outbreak of SARS.
- Zoonotic disease
Any disease that is spread from animals to people. There are many known zoonotic diseases, some of them very familiar such as Lyme disease and malaria. Less familiar zoonotic diseases (beginning with the letters “a” and “b”) include alveolar hydatid disease (echinococcosis), ancylostoma infection (hookworm), ascariasis (intestinal roundworm infection), babesiosis (babesia infection), and baylisascaris infection […]
- Zoonotic transfer
Zoonosis; Zoonotic; Zoonotic disease.