1/ At this time, we don’t yet have data showing if Pfizer-BioNTech mRNA COVID-19 #vaccine can prevent asymptomatic infection *or* transmission of the virus SARS-CoV-2.

We only have data showing it can prevent those vaccinated from getting the clinical disease of #COVID19.

2/ In English:

We know Pfizer COVID-19 vaccine offers excellent ‘direct protection’ to vaccinated folks

We don’t yet know if unvaccinated folks will get ‘indirect protection’ from vaccinated humans.

[based on publicly available data at this time - reference at end of ]

3/ What this means:

Potential risk of vaccinated humans getting asymptomatic #SARSCoV2 infection is unknown at this time.

Whether infection causes symptoms or not, vaccinated humans may still pose theoretical risk acting as ‘vectors’ (human transporter) of #SARSCoV2.

4/ Currently unknown:
If a vaccination program relying on Pfizer mRNA #vaccine alone can create ‘herd immunity’ to protect unvaccinated folks.

[Emergency authorizations were granted for Pfizer vaccine’s excellent *efficacy* in preventing mild/moderate COVID-19 disease.]

5/ Implication [applies to all ]:

Without Vaccine Effectiveness data showing that vaccination prevents *transmission* of #SARSCoV2 by infected humans, prevention & control measures aim to community transmission still needed (may be relaxed) even for vaccinated folks.