Pfizer's 90% effective COVID vaccine leaves volunteers with 'severe hangover', aches

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US health authorities hope by late next month to have some draft guidance on how to ration initial doses, but it's a vexing decision. For months, experts have warned that a new vaccine might only be 60% effective.

The announcement has injected a glimmer of hope into the hearts of people and fuel into the stock markets as well. In Louisiana, officials are planning a remote exercise this week to play out different scenarios exploring how the process might unfold. "The third biggest problem is that you do not know how many days it is effective", said Dr. Rehman. Frank Welch, director of Louisiana's immunization program.

Pfizer predicts that it will be able to manufacture only 50 million doses for global consumption by the end of the year, enough to vaccinate 25 million people. But pharmacies and other providers that do not always collect that information objected.

If we have a highly effective vaccine that stops people from passing on the virus, and can distribute it worldwide, that would have a massive impact on limiting COVID-19. Almost 7 billion people will be looking to get the vaccine, many of whom live in remote areas where it might be hard to receive more than one dose. But Şahin, who Forbes says is worth $4.5 billion, said he believes it could work for up to a year. However, he acknowledged that hospitals in remote areas that don't service many patients could initially take longer to get the vaccine than a well-trafficked hospital in a heavily populated area.

What's next for Pfizer's vaccine?

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While the government is making sure that Canadians are looked after, they are also committed to helping others across the globe.

Enrollment can be time-consuming, Reid said, because providers often need help filling out forms, getting technical systems working and going through inspections to ensure they can meet storage requirements.

Most vaccines in India need to be stored at a temperature of two to eight degrees Celsius. "We now know that vaccines can beat this virus".

The containment structures for the vaccine would be professional and expensive freezers.

Vaccines are an absolutely crucial element of any public health policy - and they usually take years to develop. After that they will spoil.

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Small bottles labeled with "Vaccine COVID-19" stickers and a medical syringe are seen in this illustration taken on April 10, 2020. It is now sending the data on these cases to the independent Data Safety Monitoring Board for analysis (Moderna remains blinded as to whether cases are in the vaccine or placebo group).

Shipping the doses will present some challenges.

"We only have indirect clues so far [regarding the duration of immunity]".

"Pfizer have said it (the vaccine) is stable for a couple of days at fridge temperature, but this is something that will make it logistically hard to roll out", said Kingston Mills, Professor of Experimental Immunology at the School of Biochemistry and Immunology, Trinity College Dublin (TCD).

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