An eight-week period between the first and second doses of the Pfizer vaccine is the “sweet spot” to produce a robust immune response against COVID-19, scientists said. Researchers in the United Kingdom have found that the larger gap between the two doses than the currently recommended three weeks generates higher antibody levels, which offer protection in fighting against infection, the Guardian reported. “The decision to put it to eight weeks is really balancing all the wider issues, the pros and cons – two doses is better than one overall,” the study’s lead, University of Oxford professor Susanna Duanchie, told the...