Two nurses manage to get a seventh dose of Pfizer vaccine


  • They investigated by observing that there was a shortage in the distribution of vaccines

  • They avoided, as the Pfizer vaccine technical data sheet says, “the dead spaces of needles and syringes”

  • The proposal they make of the method to be carried out is to use a 25G needle, the one used in the insulin syringe

Two Valencian nurses have managed, by using a needle with greater precision and with greater dead space, to extract a seventh dose from each vial of Pfizer’s vaccine, currently drawing six.

With the method to perform “we would have less losses in that ‘liquid gold’ that is the vaccine right now“, says Ana Sola Martín, a nurse at the Valencia Clinical Hospital and a professor at the University of Valencia, who has made this finding together with Natalia Coll, also a nurse.

As Sola Martín explains, when there was a shortage in the distribution of vaccines and when seeing that the second dose was pressing between the health and nursing staff, they both did “the mathematical calculation.”

“In this case we did simulation tests with different materials, this was the process until we got to achieve it,” he explained, adding that “who does these things” is the nursing staff.

According to Sola Martín, during the process they avoided, as the Pfizer vaccine technical data sheet says, “the dead spaces of needles and syringes“and they saw that” it was very important, as the technical sheet indicated, that you had to spend a specific material in this regard “.

This material, he points out, should have “larger calibers because if not, in that way you would lose more drops and those drops, as I say, they are liquid gold that right now is very scarce“.

As he explains, the calculation that Pfizer talks about in its technical data sheet is 2.25 milliliters when the dissolution is made and the doses are 0.3 milliliters, which means that 6 doses are 1.8 milliliters, which gave ” a large remnant, 0.45 milliliters. ”

“If a dose is 0.3 of course there was one more dose,” says the nurse, who points out that in the technical data sheet of the pharmaceutical company “It is not forbidden, therefore it is already an important part”.

As he explains, “if you have the same concentration, those 2.25 milliliters, you will have the same concentration in the 0.3 of the first dose as in the 0.3 of the last dose, the same proportion of the vaccine“.

“It is simply to make this verification, which we are already doing in situ, to publish it at a medical and scientific level,” says Ana Sola Martín, who adds that the proposal that they make of the method to be carried out is to use a 25G needle, the one used in the insulin syringe.

As he indicates, “it is much smaller, has more dead space and is much more precise, therefore we would have less losses in that ‘liquid gold’ that is the vaccine right now”. In the case of Moderna’s vaccine, of which ten doses are currently taken from each vial, he explains that nothing is introduced because it arrives already diluted and all you have to do is extract it.

“If you do it with the same method, with these needles of more precision and with these low dead space syringes – he adds -, we are verifying that the greater the number of doses the manufacturer has to leave more remnants and therefore you get an extra dose, in the case of Moderna of 0.5 milliliters, not 0.3 “.


Source: Telecinco – Noticias de última hora, realities y series by www.telecinco.es.

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