Household Transmission Investigation (HHTI) template protocol for respiratory pathogens with pandemic potential by World Health Organization (2023)

Official template: cdn.who.int/media/docs/default-source/documents/epp/respiratory-unity-study/unity-studies_g2_hhti.pdf

Section 1.3, printed p. 8, defines the latent period from infection to infectiousness and the incubation period from infection to clinical symptoms; Figure 1 distinguishes these intervals.