Fig. 1
From: Assessing the effect of social contact structure on the impact of pneumococcal conjugate vaccines
A neutral, age-structured, Susceptible–Colonized transmission model. Boxes represent the state variables (\(\:S\)–Susceptible, \(\:C\)–Colonized; superscripts indicate vaccine status and age: \(\:V\)–vaccinated, \(\:N\)–unvaccinated, 1–age of one year; subscripts indicate the colonizing serotype: \(\:V\)–vaccine-targeted serotypes (VT), \(\:N\)–non-vaccine serotypes (NVT), \(\:VN\)–both VT and NVT). Arrows represent the movement of individuals between states (solid arrows: green–due to colonization with VT, brown–due to colonization with NVT, blue–due to clearance of colonizing serotypes; dotted arrow: due to aging from age 0 and being vaccinated; dot-dash arrow: due to aging from age 0 and not being vaccinated, dashed arrows: due to aging). For simplicity, only the second age group (superscript 1: age of one year) is represented.
