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A SIR (Susceptible-Infected-Recovered) model and an IBM (Individual-Based Model) are employed for representing the epidemics.
A SIR value higher than 1 implies an increased risk, whereas values lower than 1 suggest a decreased risk.
A SIR of 1 indicates parity between the expected and observed number of cases (Sahai and Khurshid 1996).
Like a Sir John Falstaff".
Isn't Bob Geldof a sir?
He's a sir. She's a ma'am.
How about a Sir Alex Ferguson hairdryer?
Another fear: Calling a sir "ma'am," or a ma'am "sir".
"Ur you a Sir?" "No, I'm a poet".
"I'm not a sir," she coolly told him.
He remains a sir, and a yacht owner.
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