Vaccine rations constraints restrict the Trump administration’s hopes of making a deal with Pfizer to purchase extra 100 million doses of the business’ coronavirus vaccines, the latest delay to increase vaccine production as the Covid-19 cases quickly increases. Officials from the Trump administration and Pfizer affirmed that the two sides are fixing the issues to get the extra doses for distribution between April and June 2021. But the timing does not agree, as the US clamors for delivery at the earliest while Pfizer considers the demand globally. Health and Human Services Secretary Alex Azar announced that a complicating part in the discussions is that Pfizer is having some supply chain difficulties that will make it harder for the company to develop 100 million more doses in spring.