Human trials for H1N1 flu will start August , says University of Michigan . Concern about vaccine grew after it spread around the world earlier this year . ` Patients will be monitored two months for safety issues , followed by checkups . Vaccine so far tested only in animals , where it has proven to be effective .
Human trials for H1N1 flu will start August , says University of Michigan . Concern about vaccine grew after it spread around the world earlier this year . Patients will be monitored two months for safety issues , followed by checkups . Vaccine so far tested only in animals , where it has proven to be effective .