The major requirements of the vaccine. This includes primarlly safety and efficacy and a number of other desirable features if thevaccine is to control a disease of global importance. These include cost, easy administration (e.g. orally), thermal stability, multivalency and long-lived immunlty. Successful immunisation programmesgenerally result from high vaccineeffectiveness and adequate uptake ofvaccines. In the development of newvaccination strategies, the structure and strength of the local healthcare system is a key consideration.
The incubation period of COVID 19 (time between getting the
infection and showing symptoms) is 1 to 14 days
Some people with the infection, but without any serious symptoms
can also spread the disease.
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