Luciana A.C. Machado, PhD Profile picture
Dec 26, 2021 19 tweets 5 min read Read on X
I’ve seen many recent complaints about fake 3M Aura N95 masks. After investigating my past purchases I suspect some included fake masks 😡 🧵1/
I’ve tried purchasing the 1870+ directly from 3M or @projectn95 but this mask was never available (this is the one with a red strap, usually named “healthcare respirator”, and it’s the only one that I can properly adjust to my small face without leaks) 2/3m.com/3M/en_US/p/d/v…
So over the past 2 years I purchased the 1870+ from multiple other sources, and although “I’ve never had Covid” I suspect some of my recent purchases included fake masks 3/
Here are some of the differences noted between 2 of my recent 3M Aura 1870+ purchases👇🏻

1-Printed illustration pattern in individual plastic packaging 4/ Image
2-Instructions in Chinese in individual plastic packaging 5/ Image
3-Side sealing of individual plastic packaging 6/ Image
4-The chin tab can/can’t be seen when mask is folded 7/ Image
5-The end of the red strap is/isn’t aligned with side of the mask 8/ Image
6-Secure code is/isn’t printed on individual plastic packaging 9/ Image
7- Alignment of staples (they’re not perfectly aligned in every single mask, but I believe those from real masks may tend to have better alignment) 10/ Image
8- Markings are/aren’t located near the center front of mask 11/ Image
9-Number/size/opacity of the seam lines surrounding the mask 12/ Image
10-Size of the “holes” on top panel 13/ Image
11- Markings on the bottom panel 14/ Image
There are other less obvious differences (won’t list them here). I suspect the mask that appears on lower part of pictures is fake, but I honestly can’t tell if both masks are fake😫Unfortunately 3M website doesn’t allow the validation process for this model 15/ Image
I would really appreciate if others can share more info about this, and of course I’ll contact 3M directly to report my suspicions and will update this thread when I gather more info 16/16 FIM.
*noted= noticed (sorry)
For some reason the markings I did on each picture to show differences between masks didn’t appear as expected 😫😫😫 I won’t do the whole thread again, but I hope you can spot all the differences listed even with the wrong marking🙏🏻
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More from @machadolac

Dec 27, 2020
Até então a discussão sobre a nova variante vem sendo basicamente restrita à capacidade das vacinas continuarem a ser eficazes sob a perspectiva individual - e isso provavelmente se manterá. Porém, o fato da variante apresentar um R0 mais alto que 2 é tão preocupante quanto.🧵1/4
Isso é particularmente preocupante para o Brasil, que dependerá de vacinas de menor eficácia (AZ/Oxford e Sinovac aparentemente tem eficácia de ~ 60%), pois um maior R0 implica na necessidade de maior cobertura vacinal para se atingir a imunidade coletiva (de rebanho)2/4
Ou seja, se já era uma grande preocupação conseguir aceitação ampla da vacina, isso agora se torna obrigatório. Além disso, outra implicação que precisa ser considerada é o maior tempo que se levará para estabilizar/frear a epidemia no Brasil após o início da vacinação. 3/4
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