Can Vaccinated people spread the disease to others if they get a COVID infection?


Normally Vaccines that are highly effective (for various other diseases) prevent most vaccinated people from getting the infection completely.

But that does not seem to be the case with COVID vaccines.

The COVID vaccines are highly successful in preventing severe COVID, hospitalisations and deaths. But they seem to be a bit less effective in preventing people from catching mild COVID infections.

So if a vaccinated person gets a mild COVID infection, can they pass it onto others?

Yes, they can.

This is an important fact for people with vulnerable family members and friends.

If you have mild symptoms, do get tested and be extremely careful when you are with your vulnerable family members ( elderly parents, grandparents etc).

You can pass COVID to them even if you do not have much symptoms.

As vaccines lose some effectiveness over a period of time, do NOT assume that double vaccination would protect your vulnerable family members.

A recent Public Health England report indicates that both vaccinated and unvaccinated people with COVID infection are equally infectious and capable of spreading to others.

A similar report was also published from USA recently.

The end is not in sight yet. Be careful when you are with vulnerable family members !


Nature. COVID vaccines slash viral spread – but Delta is an unknown.
Smriti Mallapaty

CDC. How Vaccines work.

CDC. Diseases that Vaccines prevent.

U.K. Public Health England. SARS-CoV-2 variants of concern and variants under investigation in England: technical briefing 20. Ref: PHE publications gateway number: GOV-9220.

USA. BMJ. Covid-19: Delta infections threaten herd immunity vaccine strategyBMJ 2021; 374 doi: (Published 02 August 2021)Cite this as: BMJ 2021;374:n1933

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