Hello everyone. Here is a very recently published paper you may be interested in, from Trends in Parasitology:

Quality Control of Long-Lasting Insecticidal Nets: Are We Neglecting It?

Stephan Karl, Michelle Katusele, Timothy W. Freeman, and Sarah J. Moore.

Published: March 25, 2021 (DOI:https://doi.org/10.1016/j.pt.2021.03.004)

Over 2.2 billion long-lasting insecticidal nets (LLINs) for malaria control have
been delivered to recipient countries. LLINs are the largest single item in the
global malaria control budget. To be eligible for donor-funded procurement
and distribution schemes, LLIN products must attain and retain World Health
Organization (WHO) prequalification status by passing safety, quality, and efficacy
benchmarks. Predelivery inspections further test product quality before
distribution. We have shown that, despite these quality-assurance measures,
substandard LLINs were distributed in Papua New Guinea (PNG) for at least
6 years (2013–2019). Other countries may have received similar LLINs. Here, we
discuss the most important weaknesses of the current LLIN quality-assurance
framework that have made this possible.