Efficacy of a nasal spray containing Iota-Carrageenan in the prophylaxis of COVID-19 in hospital personnel dedicated to patients care with COVID-19 disease A pragmatic multicenter, randomized, double-blind, placebo-controlled trial (CARR-COV-02)
Figueroa et al., International Journal of General Medicine, doi:10.2147/IJGM.S328486 (preprint 4/15/2021)
https://c19early.org/figueroa.html