Antigenic Drift

[test123ok]

Do these drifts happen in cycles ? I mean are there a limited combination of changes ?

In other words, if one of the new antibiotics doesn't work, is it worth trying one of the old ones ?

If not, are the development of antibiotics always going to be a retroactive process...and there is no way to guide the drift to some sort of a "dead-end" ?

[norskvitnskapfrsknng]

This is the problem with orthomyxoviruses and part of the problem with HIV

In the case of influenza viruses, two different strains from different mamals (cat and human) can infect the same cell and recombine giving birth to a new strain, this happens each four or five years,

[numinousniharika]

thnx 4 all dese vids!!:)