51.   The government Thursday endorsed polio shots for children instead of the oral vaccine because of the very small chance that the oral dose can lead to a polio infection.

52.   The outbreak has been traced to the same oral vaccine that experts have used to eliminate the disease in many countries.

53.   The oral vaccine, which uses the common salmonella bacteria, could be a cheap and easy means of preventing the deadly disease.

54.   They received either three doses of the oral vaccine or a placebo.

55.   They use a highly effective oral vaccine made of live but weakened polio virus that protects not just individuals but society.

56.   A pharmaceutical firm said Thursday it had secured a US patent on an oral vaccine for the prevention of infection linked to duodenal and stomach ulcers.

57.   Until now, children received four doses of the oral vaccine.

58.   OraVac said its research has shown that H. pylori infections can be prevented using an oral vaccine.

59.   Parents received the oral vaccines with grateful smiles.