Ebola vaccine not far away; Nigeria records its second case

US top infectious disease official says there's hope that a vaccine against Ebola will be available as early as next July.

Dr. Anthony Fauci  of the National Institutes of Health says such a preventive vaccine has been successfully tested with monkeys.

Fauci tells "CBS This Morning" that human trials with volunteers will commence in September, and by July it should be ready.

More than 1,300 people have been stricken in West Africa, and nearly 730 have died in Guinea, Liberia and Sierre Leone. Nigeria recorded its second case Monday when a doctor treating the first case tested positive for the virus. Both cases have occurred in Lagos — African's most populous city with about 20 million people.

Ebola currently has no vaccine or antidote. It is contracted through close contact with bodily fluid and blood, unlike other airborne viruses.