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In our systematic review, we identified 10 RCTs that reported estimates of the effectiveness of face masks in reducing laboratory-confirmed influenza virus infections in the community from literature published during 1946–July 27, 2018. In pooled analysis, we found no significant reduction in influenza transmission with the use of face masks (RR 0.78, 95% CI 0.51–1.20; I2 = 30%, p = 0.25) (Figure 2). One study evaluated the use of masks among pilgrims from Australia during the Hajj pilgrimage and reported no major difference in the risk for laboratory-confirmed influenza virus infection in the control or mask group (33). Two studies in university settings assessed the effectiveness of face masks for primary protection by monitoring the incidence of laboratory-confirmed influenza among student hall residents for 5 months (9,10). The overall reduction in ILI or laboratory-confirmed influenza cases in the face mask group was not significant in either studies (9,10). Study designs in the 7 household studies were slightly different: 1 study provided face masks and P2 respirators for household contacts only (34), another study evaluated face mask use as a source control for infected persons only (35), and the remaining studies provided masks for the infected persons as well as their close contacts (11–13,15,17). None of the household studies reported a significant reduction in secondary laboratory-confirmed influenza virus infections in the face mask group (11–13,15,17,34,35). Most studies were underpowered because of limited sample size, and some studies also reported suboptimal adherence in the face mask group.

https://wwwnc.cdc.gov/eid/article/26/5/19-0994_art...

So benissimo che ci sono studi che dicono l'opposto, ma purtroppo l'approccio dei cosidetti "ufficalisti" di regime non è molto migliore di quelli che gli stessi criticano come "complottisti"

Esempio proprio sullo studio in questione




TL,DR il presentatore di questa radio porta allo geologo Mario Tozzi lo studio scientifico di cui sopra, studio che afferma che sostanzialmente le mascherine servono a poco e nulla per contrastare il virus (lo studio dice influenzale ma presumo valga lo stesso per il covid). Tozzi non prende mai in considerazione questo studio nonostante le fonti siano autorevoli, ma si nasconde dietro il fatto che "ce ne sono altri che dicono il contrario". Inoltre rifuta l'invito ad un confronto e da del disinformatore al presentatore etichettandolo come "pericoloso". Tipico approccio da saccentello ufficialista che non vuole mettere in discussione i suoi dogmi.