Malaria is caused by a complex parasite that makes it hard to target with a vaccine.

VOA: standard.2010.01.20

"On the operations we are having at the moment, it is completely wrong to say that the loss of lives has been caused by the absence of helicopters,".

VOA: standard.2009.07.22

"We also have reports of civilian casualties, but the info we have from the Afghan National Army on the ground is that it is believed that that was caused by insurgent mortar fire,".

VOA: standard.2009.09.12

"The scene here at the bottom of the hill where hundreds of houses have been destroyed by a landslide caused by the earthquake, the scene is one of rescue, it's just pure rescue effort that seems devoid of emotion,".

VOA: standard.2009.09.03