Women who will receive Pfizer’s COVID-19 vaccine must not breastfeed or get pregnant for two months after immunization. A safety guide released by the British government said that children and pregnant or breast-feeding mothers should not be immunized using the vaccine. The guide also mentioned that any effects of the pharmaceutical firm’s vaccine candidate on fertility are “unknown.”
The U.K. government’s 10-page Reg 174 Information for U.K. Healthcare Professionals describes how Pfizer’s BNT162b2 mRNA vaccine, developed with German firm BioNTech, should be stored, diluted and administered to people.
Section 4.6 of the guide, which deals with fertility, pregnancy and lactation said: “COVID-19 mRNA Vaccine BNT162b2 is not recommended during pregnancy … [and] should not be used during breast-feeding.” It also warned women of child-bearing age that “pregnancy should be excluded before vaccination” and “to avoid pregnancy for at least two months after their second dose.”
Prior to the safety guide, two medical professionals wrote to the European Medicine Agency to stop human trials. Doctors Wolfgang Wodarg and Michael Yeadon indicated in their Dec. 1 letter that some of the vaccines to be tested, including that of Pfizer’s, may prevent the safe development of placentas in pregnant women.
The doctors explained that “several vaccine candidates are expected to induce the formation of humoral antibodies against spike proteins of SARS-CoV-2,” among them syncytin-1. This protein found in the spike proteins of SARS viruses is also responsible for the development of a placenta in human beings. Wodarg and Yeadon further elaborated: “There is no indication whether antibodies against spike proteins of SARS virus would also act like anti-syncytin-1 antibodies. However, if this were to be the case, this would then also prevent the formation of a placenta – which would result in vaccinated women essentially becoming infertile.”
Children’s Health Defense reported in August that mRNA vaccines such as that of Pfizer and Texas-based pharmaceutical firm Moderna rely on a nanoparticle-based “carrier system” containing a synthetic chemical called polyethylene glycol (PEG). The report also mentioned that the use of PEG in drugs and vaccines is “increasingly controversial” as numerous adverse reactions caused by the chemical have been documented. The anti-vaccination group warned that if an mRA vaccine for COVID-19 is approved, more people would be exposed to PEG – a “potentially disastrous” scenario. (Related: Experts warn mRNA vaccines could cause irreversible genetic damage.)
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