Poxviruses ·Smallpox(Variola ·Smallpox virus (Orthopox virus) 。Variola major has 20%mortality 。Variola minor has <1%mortality ·Monkeypox 。Prevention by smallpox vaccination Figure 21.9 • Smallpox (Variola) • Smallpox virus (Orthopox virus) • Variola major has 20% mortality • Variola minor has <1% mortality • Monkeypox • Prevention by smallpox vaccination Poxviruses Figure 21.9