How many day-old embryonated eggs were used by Reyniers to rear first germ-free animals?

Which among the following was the first germ-free animal to be reared?

Which of the following vitamins are not required by normal animals?

Germ-free animals require lower levels of B vitamins.

Pseudomembranous colitis is caused by the strains of which of the following microorganism?

Where does the Streptococcus mutans adhere to the body site?

Which of the following microorganism produces colicins in the intestine?

Bacteria can be grown on the dry surface of skin.

Which of the following bacteria are found in the nose?

The microorganisms stick to which of the following regions of the respiratory tract?

Alveolar macrophages are phagocytic in nature.

Which enzyme is required for the production of glucan?

Enterococci is found in which part of the intestine?

Which of the following is not a Gram-positive bacilli?

Which microorganism among the following can live as a commensal but can also be pathogenic?

Degree of pathogenicity is referred to as _________________

Which type of strains are used in vaccines?

The LD50 dose can be determined more precisely than LD100 dose.

Microbial adherence is selective in nature.

When the infection occurs suddenly and with severe intensity it is known as ______________

Tuberculosis is which type of infection?