On 1/5/21 10:06 am, Paul Brooks wrote: > Roughly 50% reduction in infection rate according to Public Health England > https://www.aljazeera.com/news/2021/4/28/one-dose-of-covid-vaccine-halves-transmission-study-shows
Thanks Paul! > ... those who became infected three weeks after receiving their first jab of the Pfizer-BioNTech or AstraZeneca vaccines were between 38 and 49 percent less likely to pass the virus on to their household contacts compared to others who were unvaccinated. > “We had not been certain that vaccines would be able to reduce transmission at all, so the fact that this now seems to be working with just a single dose of either the Pfizer-BioNTech or AstraZeneca vaccine is really good news,” Forrester-Soto [a virologist at UK’s Keele University] told Al Jazeera. Quick, rough check. If the newer variants nearly-doubled the infection-rate of the original, and first-round vaccination has subsequently less-than-halved it, the spread-rate is back where it was with the original virus. So maybe the rate at which restrictions are being eased in the US and the UK is a bit on the incautious side? > ------------------------------------------------------------------------ > *From:* Roger Clarke <[email protected]> > *Sent:* 1 May 2021 9:29:52 am AEST > *To:* [email protected] > *Subject:* Re: [LINK] Covid 'Cures' cf. Spread-Dampening > > On 30/4/21 4:29 pm, Stephen Loosley wrote: > > Revealed: How a single pill home-cure for Covid could be available > this year ... > > > Aside: I worry about any source that uses the word 'cure'. > > > On a related matter, the US and UK appear to be working on the > assumption that, once some level of the poulation has been vaccinated, > herd immunity is being approached and restrictions can be eased. > > But the vaccines were designed to be protective of the vaccinated > individual against the virus. > > The extent to which the vaccines reduce the capacity of vaccinated > people from spreading the virus appears to be unclear from the science, > and hence dependent on empirical evidence from social experiments. > > Has anyone seen any serious attempts to assess the effectiveness of the > vaccines in reducing infections? > > (As distinct from effectiveness in reducing the impact of the virus on > infected individuals - which I gather does seem to be the case with most > of the various vaccines). > > > -- > Sent Unplugged -- Roger Clarke mailto:[email protected] T: +61 2 6288 6916 http://www.xamax.com.au http://www.rogerclarke.com Xamax Consultancy Pty Ltd 78 Sidaway St, Chapman ACT 2611 AUSTRALIA Visiting Professor in the Faculty of Law University of N.S.W. Visiting Professor in Computer Science Australian National University _______________________________________________ Link mailing list [email protected] https://mailman.anu.edu.au/mailman/listinfo/link
