• takes 5 days post op for infection
• unless IC or previously infected
• match degree of erythema with clinical (unwell, pain etc)

dose/ infection rate changes with CFUs and virulence of bacteria

<10^3 no infection

10^7 all infeted

mean 10^5

<aside> 💡 ID50: 50% people get infected

</aside>

left shift of infection dose curve: (less bacteria required to cause infection)

• FB
• devascularised tissue
• immunodeficet
• immunosuppressive

Right shift