Avaccine can protect you against a disease because it a. destroy toxic substances from bacteria before they can make u sick b. stimulated your immune system against the pathogen c. kills any pathogenic bacteria in your body d. changes pathogenic into harmless bacteria

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's