61.   Similarly, alternatives to cefazolin are active against many more strains of bacteria than it is and may also cause infections resistant to antibiotics.

62.   Some are considered more deadly to humans, meaning that fewer spores of the germ could cause infection.

63.   Some researchers say douching may flush away beneficial bacteria, while others say it may cause infections by propelling harmful bacteria and other organisms into the cervix.

64.   Swimming in polluted water is liable to cause an infection.

65.   That leaves open the possibility that some HIV infections were caused by patient-to-patient transmission through dental instruments in past years.

66.   The bacteria cause infection when they are ingested, usually through tainted food or water, or when there is exposure to an infected person.

67.   The amoebae also can cause eye infections that result in blindness, the CDC said.

68.   The booster shot is made from a weakened form of the adenovirus, which typically causes respiratory infections.

69.   The biology of HIV is different from other viruses, particularly those that cause acute infections, Greenberg said.

70.   The infection is caused by a mycobacterium that lives in natural aquatic environments, but it has also been found in home aquariums and even swimming pools.