Pfizer facing 'various challenges' in COVID-19 vaccine manufacturing, dosing: feds

Pfizer facing 'various challenges' in COVID-19 vaccine manufacturing, dosing: feds

Source: 
Fierce Pharma
snippet: 

Why did healthcare workers in California and Alabama have to return trays of Pfizer’s COVID-19 vaccine after discovering they were stored at temperatures that were colder than recommended? Does each vial of the vaccine contain more than the expected five doses, and if so, can those be used to meet the high demand for the shot?