Apparently, researchers are getting close to a universal vaccine that will guard against many different strain of human influenza but also related ones that attack pigs and poultry. However, epidemiologists are becoming . . . increasingly gloomy that the more research biologists develop vaccines the weaker our immune systems will become in due course and leave ourselves open to brand new virus.
The more gaps we leave in the human immune system, the more niches are made available for virus mutations, some of them serious killers. This is a much more serious problem than, say, bouts of seasonal flu, and will have to be solved one day the more vaccines we have in our armoury of the known diseases.. There’s a parallel problem concerning bacterial diseases and antibiotics which we are already meeting head-on with drug-resistant resident bacteria in hospitals.