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		</div><p>The effectiveness of the Pfizer vaccine wanes slightly over time but it remains strongly protective for at least six months after the second dose, according to company data.</p>
<p>The findings are one piece of evidence that US health authorities will consider in deciding if and when booster doses might be needed.</p>
<p>Pfizer and its German partner BioNTech have said they plan to seek authorisation for boosters.</p>
<p>The new data comes from a 44,000-person study that initiated the widespread use of the vaccine, showing it is highly effective in the first few months after immunisation.</p>
<p>Now the companies have tracked those study participants for six months and counting.</p>
<p>Most importantly, protection against severe Covid-19 remains very high, at nearly 97%, researchers found. Overall, protection against symptomatic Covid-19 was 91% over the six-month period.</p>
<p>A closer look shows that efficacy against any symptomatic infection dropped gradually every two months, from a peak of 96% two months after study participants got their second dose.</p>
<p>By month four efficacy was 90%, and by six months it was about 84%.</p>
<p>The study results were posted online but have not undergone full scientific review.</p>
<p>They do not single out how the vaccine works against the highly contagious Delta variant, but the companies cite separate testing and real-world data showing the jabs counter it.</p>
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