Quotes About Infectivity

With influenza and many other diseases the order is reversed, high infectivity preceding symptoms by a matter of days. A perverse pattern: the danger, then the warning. That probably helped account for the scale of worldwide misery and death during the 1918–1919 influenza: high infectivity among cases before they experienced the most obvious and debilitating stages of illness.

When the Next Big One comes, we can guess, it will likely conform to the same perverse pattern, high infectivity preceding notable symptoms. That will help it to move through cities and airports like an angel of death.

So you have density, infectivity, mortality, and recovery—four factors interrelated as fundamentally as heat, tinder, spark, and fuel. Brought together in the critical measure of each, the critical balance, they produce fire: epidemic.

If SARS had conformed to the perverse pattern of presymptomatic infectivity, its 2003 emergence wouldn't be a case history in good luck and effective outbreak response. It would be a much darker story.

The much darker story remains to be told, probably not about this virus but about another. When the Next Big One comes, we can guess, it will likely conform to the same perverse pattern, high infectivity preceding notable symptoms. That will help it to move through cities and airports like an angel of death.

One of the most important problems in epidemiology is to ascertain whether this termination occurs only when no susceptible individuals are left, or whether the interplay of the various factors of infectivity, recovery and mortality, may result in termination, whilst many susceptible individuals are still present in the unaffected population.

Great Britain had a much different situation than we do and did here in the United States, in that they had literally thousands of infected animals with human health risks. Their infectivity in this disease happened before very much was known about it.

Great Britain had a much different situation than we do and did here in the United States, in that they had literally thousands of infected animals with human health risks. Their infectivity in this disease happened before very much was known about it.