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Pfizer vaccine less effective after 6 months, study says - Reuters

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https://news.google.com/__i/rss/rd/articles/CBMiK2h0dHBzOi8vd3d3LnlvdXR1YmUuY29tL3dhdGNoP3Y9b1poZGZuZXZjRVXSAQA?oc=5

2021-10-05 12:28:17Z
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