the berlin patient, a man called timothy brown who seems to have a genetic mutation that allows him to are avoid the infection. >> timothy brown, in a way you can get more cells that are genetically changed, and we think have a better chance of bringing about what would be a cure, in which the immune system's resistant and that immune system can handle any virus that's left over in the body. >> a few doctors are also concerned about another challenge. they worry that by suppressing hiv in the body existing antiviral medications could be causing the virus to develop a resistance to the drugs we have. science is already struggling to contain the virus that we know about. if that virus begins ochange we'll have to rethink our -- approach and to the 2.1 million people on the planet newly infected each year. jake ward, al jazeera, san francisco. >> there is a new rush but they're not digging forgold. why farmers instead are drilling for water. leader. did you know a ten-second test could help your business avoid hours of delay caused by slow internet from the phone company? that's enough ti

the so-called berlin patient a man named timothy brown seems to have a genetic mutation that allows him to riz the drug. >> timothy brown, in a way in which you can get more sells that are genetically changed, and bringing about a cure in which the immune system's resistant and that immune system can handle any virus that's left over in the body. >> i thought that well, maybe we can knock out a normal gene and then make the cell resistant. and then the patient team of mr. brown came along and said that yes you can do it in another person. >> they are concerned by another challenge. they worry that suppressing hiv in the body existing antiretroviral medicines can cause a resistance to the drug we have. >> if we are throwing these drugs to everybody and whether they are used correctly or not we are going to end one multi-resistant viruses which are now appearing. >> scientists are already beginning to control the virus we know about. approach to a cure and to managing to 2.1 million people on the planet newly i in newly d each year. jacob ward, al jazeera, san francisco. >> a number of th

he is trying to replicate the berlin patient, timothy brown, who seems to have a genetic mutation that let's him resist the infection. >> the genetic approach allows us to mimic timothy brown but in a way in which you can get more cells that are genetically changed and we think have a better chance of bringing about what would be a cure in which the immune system is resistant. >> a few doctors are concerned about another challenge, worry that by suppressing h.i.v. in the body, existing anti viral medications could be causing the virus to develop a resistance to the drugs we have. scientists already struggling to contain the virus we know about, if that virus begins to change, we'll have to rethink our approach to a cure and to managing the 2.1 million people on the planet newly infected each year. aljazeera, san francisco. >> here now to talk about the fight against h.i.v. is a doctor from the n.c. school of medicine, joining us this morning in the studio. i really want to talk about the root of this drop in cases in the u.s. where the rate has fallen by a third. what is behind that. >

timothy quinn. he served as the executive director. tim, i was born and raised in california. look, we are no strangers to droughts. water restrictions, brown lawns, green painted. this is common. how bad is this drought compared past? >> it's unprecedented. last year was the driest year on record. this year the third driest year. this is the third year of this drought. our economy has grown, reservoirs are nearing empty. we are heavily regulated. this is my third drought. i have certainly never seep to this bad. -- seen to this bad. i don't think it has been this bad. this is un% depth. a -- unprecedented. the drought will cost more than $2 billion, coming from the agricultural sector. california grows a huge amount of food. how will this affect food prices throughout the country in. >> not a lot. in the future if it gets worse, it will have an impact. it grows 70-80% of many of the fruits and ven table that the americans consume. farmers in the central valley, one of the most productive agricultural regions, it would be worse, except they are turning heavily to groundwater. they lost supplies, turning back to pump five feet. the groundwat

timothy quinn, serves as executive director of the association of california water agencies. tim i was born and raised in california. look we're no strangers to droughts, water restrictions, brown lawns, green-painted lawns. all common. how does this compare to what we've seen in the past? >> it's pretty unpresence dented. last year was the dryest year on record. this year was the third dryest year on record. as you mentioned woj thi waj, or reservoirs are nearly imment. empty. i've certainly never seen it this bad. i don't think it has ever been this bad. this is historically unprecedented. >> a study by u.c. davis says the drought will cost california $2 billion. california grows a huge amount of food consumed in the u.s. how will this affect the country? >> not a lot but if this drought gets worse it will have an impact. california grows 70, 80% of much of the produce that americans school. california one of the most productive agricultural regions in the world, they're turning heavily towards groundwater. they've lost about 600 million acre feet a year of surface supplies, that groundwater is going to run out. they can't keep doing that. if we keep having dry years it's goi