A laboratory blood test is 95% effective in detecting a certain disease when it is, in fact, present. However, the test also yields a "false positive" result for 1% of the healthy persons tested. That is, if a healthy person is tested, then with a probability of 0.01, the test result will imply that he or she has the disease. If 1% of the population actually has the disease, what is the probability that a person has the disease given that the test result is positive?