The agencies they are investigating reports that six women experienced blood clots in conjunction with low platelet counts in the days following their Johnson & Johnson vaccine.
The AstraZeneca vaccine has caused concerns in Europe but The WHO insists that it's unlikely there is any correlation between the reported issues & the vaccine.
The problem with immediately identifying the coronavirus is that it has a two week incubation period. That means if you contract the virus, you may not have ANY symptoms for two weeks