The 3-4 week spacing was based on the first clinical results that came back. Now that we have data on longer spacings, it looks like waiting at least 3 months r

The 3-4 week spacing was based on the first clinical results that came back. Now that we have data on longer spacings, it looks like waiting at least 3 months results in a stronger immune response. https://www.bmj.com/content/372/bmj.n18 https://www.bmj.com/content/372/bmj.n18 https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.3001211 https://journals.plos.org/plosbiology/article?id=10.1371/jou... We had to rush the second shots to get immunity quickly, but for a later booster, the required dose might be a lot lower.