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The director of the infectious diseases department of the Umberto I hospital in Syracuse Antonella Franco tested positive for the coronavirus after receiving the first dose of the Pfizer-BioNTech vaccine on December 28 in Palermo. “I tested positive for Covid but I would get the vaccine again and I will make the withdrawal that represents the only great opportunity we have to win this battle. If I had not done it, the virus without being disturbed would have done me irreversible damage,” he said yesterday . , currently hospitalized in her own ward. And having organized a bus for the transfer from Syracuse to Palermo, the risk is that the other first vaccinated people from Arezzo may have been exposed to the virus. But why is it possible to get infected after just one dose of the vaccine?
Because infection is possible after a single injection of the vaccine.
“Immune protection is complete only after the administration of the second dose of the Covid-19 vaccine,” explained yesterday the president of the Higher Health Council, Franco Locatelli. “In scientific articles it is clearly reported that even in clinical studies people are infected after the first dose precisely because the immune response is not yet fully protective. And it is only after the second dose. This is one of the reasons for not abandoning responsible behavior after vaccination ”.
In addition, it is suspected that the doctor, one of the first in Sicily to receive the vaccine, could already have the asymptomatic infection in incubation. Dr. Franco is part of the group of health workers at the forefront of the fight against Coronavirus. And for her role, the medical director was continually cleansed and elected to the first administrations.
Full efficacy (95%) is achieved one week after the second dose, which should be done three weeks after the first. Antonella Franco said that she had swabbed several times before being vaccinated, that it was always negative, so it is likely that she was in the incubation phase or that she was infected very recently.
“The data related to the Pfizer vaccine estimate an efficacy of 52% after the first dose, which increases with time, to exceed 80% after ten days”, explains today to the Corriere della Sera Stefania Salmaso of the Italian Association of epidemiology, formerly head of the National Center for Epidemiology, Surveillance and Health Promotion of the Higher Institute of Health -. With the second administration the expected efficacy is around 95%. For this reason, an infection identified six days after the first dose is not a failure, nor is it a case of vaccine ineffectiveness. ”
