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The Guardian reported on 26 August 2020 that :

Citriodiol-based spray can help protect against Covid-19, says MoD lab

Citriodiol sprays were made available to the army in the early phases of the Covid-19 crisis because they were known to kill other strains of coronavirus such as Sars.

The Ministry of Defence released an eight-page paper from the Porton Down-based Defence Science and Technology Lab (DSTL), which tested the efficacy of Mosi-guard, a Citriodiol-based spray, on plastic and artificial skin.

Jeremy Quin, a junior defence minister, said the research found that sprays containing Citriodiol “can kill the virus”.

Confusingly, the article further says that the DSTL laboratory also states :

However, some virus was still recoverable over a four-hour period.

Is mosquito repellant actually effective or is it not ?

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    The title asks about "protection", the final question is about "effective". I don't see any claim about either of those presented in the article, only some reduction in virus. – BowlOfRed Dec 16 '20 at 4:48
  • @BowlOfRed Jeremy Quin, a junior defence minister, said the research found that sprays containing Citriodiol “can kill the virus” – Nigel J Dec 16 '20 at 5:02
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    The claim in the Guardian is a bit murky (the headline writer (and perhaps the first paragraph) over-states what the writer has written throughout the rest of the article) but it seems to be "Yes, it killed some of the virus, but it isn't clear if it is enough to make a difference in practice." Your question demands an answer to a claim that isn't being made, because it is unknown: Is it protective? Is it effective? – Oddthinking Dec 16 '20 at 6:04
  • ... so it's better to ask this on medicalsciences.stackexchange.com which doesn't require a clear-cut claim to challenge. – Fizz Dec 16 '20 at 6:36
  • Or learn to accept that some things just aren't known yet, and it is okay to not be sure. Come back in 6-12 months and maybe there will be answers. – Oddthinking Dec 16 '20 at 7:14

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