A mix of ingredients at a manufacturing plant in Baltimore destroyed 15 million doses of Johnson & Johnson vaccine against Covid-19, according to The New York Times. This may delay future deliveries of this vaccine. There is no problem with the Johnson & Johnson vaccine doses already delivered, which were produced in the Netherlands, but the tens of millions of doses that were supposed to be shipped in April will no longer be able to be shipped on time.

The manufacturing plant, run by Emergent BioSolutions, received $ 628 million from the Trump administration last year to expand vaccine production capacity. The plant was still awaiting FDA authorization for its Johnson & Johnson vaccine production lines, and this major mistake - which Times sources attributed to human error - is likely to delay it further. It is unclear how this hurdle will affect the availability of this vaccine in the coming weeks, but the restriction could hurt efforts by the United States and other countries to vaccinate enough people for "herd immunity." 

The Johnson & Johnson vaccine works only with one dose and the established method is the most well known and used by doctors.

Source: CNN, The New York Times