 GlaxoSmithKline PLC GSK , Financial, Pfizer Inc. PFE , Financial and Johnson Johnson JNJ , Financial should all know about mid-year if the shots theyre developing for a common and potentially fatal virus is effective. No, the it isnt for Covid-19, but for respiratory syncytial virus, which causes an estimated 177,000 hospitalizations among older adults each year and 58,000 in children under five. 