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...2, which people have never encountered before. In order to produce an effective immune response, the small number of lymphocytes that can recognise a virus must become more abundant. Even though lymphocytes proliferate quickly it still takes several days before there are sufficient cells available to fight back against the infection. During this period the virus may also...

...2 develops the idea of sequences and convergence in metric spaces. Section 3 builds on the ideas from the first two sections to formulate a definition of continuity for functions between metric spaces...This free course contains an introduction to metric spaces and continuity. The key idea is to use three particular properties of the Euclidean distance as the basis for...

...2 is concerned with moments and covers, the concept of expectation or expected value, the familiar notion of the mean, also known as the first moment, two general definitions of moments, variance, random variables linked by linear transformation and finally, how to deal with moments all in one go, using the moment generating function...This free course looks at a number...

...2 might not release interferons to the same degree as with other viral infections. Unlike the innate immune system, the great advantage of the adaptive immune system is that it remembers the viruses and bacteria it has encountered.More targeted interventions against viruses come from the adaptive immune system. The adaptive immune system also involves leukocytes, such as...