Absolutely people must worried about the another variant cause we are not done yet by the Covid-19 Virus and we are not 100% has a cure ,cause Vaccine is not really the cure it's just a preventive medical so we can not affected or get virus but it's sad news that we heard that some die because of The Vaccine's cause their body can't accept the strong dosage. Hoping this two Variants will desappear so that we can live normal life 
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.I just read yesterday that vaccinated doesn't protect anymore against the delta variant. The Pfizer Biontech vaccine had the highest immunity with 95%, but after tests in Israel where a large part of the population was vaccinated with Pfizer, the immunity dropped down to 65%. This is very scary, because we had so many variants already. With the next mutation the immunity could drop down to 30%.
Generally 65% is within the acceptable range and is capable of reaching herd immunity. The main issue is that some people are choosing not to get vaccinated. With the lower rates of effectiveness more people would need to be vaccinated in order to reach herd immunity than before, but people seem not to understand that unfortunately and use its reduced effectiveness as a reason not to get vaccinated in the first place. I remember feeling the same way as I do now about the delta when covid first came out, that there's no way it will spread that far, but we will have to just wait and see, cause for all we know its just the beginning; maybe the beginning of nothing at all, we just don't know yet