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ONE study, like one swallow, doesn't make a summer. Hence the need for boosters:The Israeli study I linked to earlier is the latest attempt to measure how long and how good immunity is from infection and vaccines. Natural immunity seems to last much longer...with one jab on top comes a slight improvement. ..but I see no reason why anti body tests that show high levels are not as good as these vaccines given that 2jabs without previous infection is not as good as previous infection alone.
Israeli study: COVID booster shots 92% effective at preventing serious illness
Research published in Lancet also finds 3rd shot 81% more effective in preventing deaths compared to those who've had only 2 shots at least 5 months ago