The drug maker Pfizer says it will work with four states — Rhode Island, Texas, New Mexico, and Tennessee — to refine their plans for delivering and administering its Covid-19 vaccine before the vaccine receives its expected authorization. The step reflects the complexity of distributing on a large scale a vaccine that requires ultracold storage.
The pilot program, which the company announced on Monday, is aimed at helping the states with their planning, but it will not mean that they receive doses of the vaccine any earlier than other states do. The four participants were chosen to represent states of different sizes, populations, and existing capacities for delivering vaccines against other viruses, the statement said.
“We are hopeful that results from this vaccine delivery pilot will serve as the model for other U.S. states and international governments,” Angela Hwang, a Pfizer executive, said in a statement.
Pfizer, which announced last week that an early analysis had found its vaccine to be more than 90 percent effective, expects to collect the final safety data this week that it needs to submit its results to the Food and Drug Administration. Another developer, Moderna, announced on Monday that its vaccine candidate appeared to be 94.5 percent effective in an early analysis.
Both vaccines use what is known as messenger RNA technology, but their cold storage requirements are different. Pfizer’s vaccine must be kept much colder, at around minus 70 degrees Celsius, for long-term storage, though it can be kept for short periods in a conventional freezer or a cooler. That ultracold storage requirement could hinder its distribution, particularly in rural areas.
Moderna’s vaccine, on the other hand, can be kept for up to a month at 2 to 8 degrees Celsius (about 36 to 46 degrees Fahrenheit), the temperature of an ordinary refrigerator, the company said on Monday.
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