Nov 8 (Reuters) - Pfizer and German partner BioNTech are expected to seek authorization for their COVID-19 vaccine booster shot for people aged 18 and above as soon as this week, Washington Post reported on Monday, citing officials familiar with the situation. The U.S. Food and Drug Administration (FDA) in September authorized the extra shot for those aged 65 and above, people at high risk of severe disease, and others regularly exposed to the virus. Pfizer and U.S. health officials have argued that the boosters prevent hospitalizations and deaths and that emerging data indicates they can slow mild infections as well. read more Pfizer did not immediately respond to Reuters" request for comment.