Table 1:
State variables of the HIV/AIDS basic model.
Symbol
Description
𝑆
(
𝑡
)
Susceptibles or HIV negatives at time
𝑡
𝐼
1
(
𝑡
)
HIV-infected individuals unaware of their status
𝐼
2
(
𝑡
)
HIV-infected individuals aware of their status
𝑃
(
𝑡
)
Pre-AIDS individuals at time
𝑡
𝐴
(
𝑡
)
AIDS individuals at time
𝑡