Does President Obama really have parasites? Is his health good?

I read an article that stated that on a recent vacation trip to Hawaii, President Obama contracted parasites in his body and has lost a tremendous amount of weight, because of it. Has this report proven to be true? If so, were any of his family members infected? Question: if the President becomes sick and unable to serve, will the Vice-President be able to handle the many affairs of the United States Government?