State why certain diseases are called infectious.
A person received an injection to provide protection against infectious disease E. This person had not previously been infected with disease E. $26$ days later, a second injection to provide protection against disease E was administered. The concentration of the antibody specific to disease E in the blood was measured over a period of $60$ days starting from the first injection. Fig. 4.1 shows the antibody concentration in the blood during the $60$ day period.
Explain why the antibody concentration in the blood was greater after the second injection than after the first injection.
State the type of immunity produced by the injection used as protection against disease F.
Describe the features of the type of immunity that results from the injection used as protection against disease F.
Name the bacterium responsible for TB.
Suggest and explain how knowledge gained from this research could improve TB treatment and reduce the chance of rifampicin-resistant bacteria developing.
Suggest and explain how knowledge gained from this research could improve TB treatment and reduce the chance of rifampicin-resistant bacteria developing.