An optimisation of four SARS-CoV-2 qRT-PCR assays in a Kenyan laboratory to support the national COVID-19 rapid response teams by Said, K, de Laurent, Z, Omuoyo, D, Lewa, C, Gicheru, E, Cheruiyot, R, Bartilol, B, Mutua, S, Musyoki, J, Gumba, H, Mwacharo, J, Riako, D, Mwangi, S, Gichuki, B, Nyamako, L, Karani, A, Karanja, H, Mugo, D, Gitonga, J, Njuguna, S, Gumbi, W, Tawa, B, Tendwa, M, Cheruiyot, W, Sein, Y, Nyambu, J, Patta, S, Thani, TS, Maitha, E, Kitole, B, Mwakinangu, M, Muslih, B, Otieno, JO, Nyiro, J, Kiyuka, P, Ndwiga Marigi, L, Wamae, K, Kimani, D, Makale, J, Morobe, JM, Osoti, V, Lambisia, A, Odundo, C, Mwarumba, S, Mutunga, M, Bejon, P, Tsofa, B, Agoti, C, Ochola-Oyier, LI