1.   Only in the last two weeks had the malaise set in, ever since his lung infection had taken hold.

2.   Some development usually takes place either in the faecal pat or in a different species of animal, the intermediate host, before infection can take place.

3.   When the skin is damaged other infections can take hold more easily.

4.   An upper respiratory infection or nasal allergy can block drainage from a sinus cavity and permit a bacterial infection to take hold in the accumulating mucus.

5.   Awareness comes only when the infection has taken hold and symptoms appear.

6.   A number of conditions can tip the acid-base balance or otherwise allow an infection to take hold.

7.   But there is little human data on how the infection takes hold in individuals or how an outbreak moves through populations.

8.   But they said the area where the chicken had been placed had been sprayed with pesticide after the infection took place, and no more spraying was planned.

9.   Health department investigators also sent blood samples to the CDC for genetic sequencing to determine whether the infections had taken place at the clinic.