Juan Jesus Carrero – The Conversation

Layering face masks has been suggested as a way to increase protection against COVID-19 variants that may be more transmissible. (Shutterstock)

February 11, 2021

Are two cloth masks better than one for preventing the spread of COVID‑19?

Catherine Clase, McMaster University; Charles-Francois de Lannoy, McMaster University; Juan Jesus Carrero, Karolinska Institutet; Roberto Pecoits-Filho, and Scott Laengert, McMaster University

Are two face masks better than one? Adding layers of filtration by double masking is a way of using the masks that we already have, possibly to better effect.

Bien que l’usage du masque en tissu soit assez généralisé, de nombreuses interrogations subsistent. (Unsplash/Vera Davidova)

October 23, 2020

Tout savoir sur les masques anti Covid‑19 en tissu, en cinq questions

Catherine Clase, McMaster University; Edouard Fu, Leiden University, and Juan Jesus Carrero, Karolinska Institutet

Les épidémiologistes ont passé en revue 25 études sur les masques en tissu. Voici ce qu’ils ont découvert sur leur efficacité, leurs raisons d’être et comment ils protègent – ou pas.

Although cloth masks have been widely adopted, many people still have questions about them. (Usplash/Vera Davidova)

October 12, 2020

COVID‑19 masks FAQs: How can cloth stop a tiny virus? What’s the best fabric? Do they protect the wearer?

Catherine Clase, McMaster University; Edouard Fu, Leiden University, and Juan Jesus Carrero, Karolinska Institutet

Epidemiologists reviewed 25 studies of cloth face masks. Here’s what they found out about how well they work, why they work, who they protect and why the mosquito and chain-link fence analogy is wrong.

Contact Juan for