Select the correct statement with respect to diseases and immunisation.

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Certain protozoans have been used to mass produce hepatitis B vaccine

Injection of snake anti-venom against snake bite is an example of active immunisation

If B and T lymphocytes are damaged due to some reasons, the body will not produce antibodies against a pathogen

Injection of dead/inactivated pathogens causes passive immunity

answer is C.

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Detailed Solution

The B and T lymphocytes are the cells of the immune system. They work together to form antibodies and fight against diseases. The B cells produce the antibodies directly, while the T cells stimulate the B cells to produce the antibodies.

Unicellular eukaryotic yeast cells (Saccharomyces cerevisiae) are used for the mass production of hepatitis B vaccine. The yeast cells are made to produce the hepatitis B antigen.

Snake antivenom is an example of passive immunisation.

Active vaccines refer to those vaccines that use the antigens in attenuated or heat-killed form. It brings about active immunity.

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