But some experts contend that just a few spores, maybe even a single spore, could infect a susceptible person in rare circumstances.

Yet it seems impossible to rule out that somewhere a contaminated letter may still cross the path of a highly susceptible person, with tragic consequences.

But there's no such thing as a cat that can't cause an allergic response in a susceptible person.

The final stage in the chain of infection is a susceptible person.

Any blood or body fluid exposure sustained by an unvaccinated, susceptible person should lead to the initiation of the hepatitis B vaccine series.

That's one reason this part of town can put a susceptible person in a wistful state of mind.

Hicklin test (1868): the effect of isolated passages upon the most susceptible persons.

I'm a very susceptible person, easily influenced, a natural-born follower with no sales-resistance.

The disease may be triggered in a susceptible person by environmental factors.

Therefore, the disease transmission to other susceptible person cannot be prevented.