What is most likely a benefit of using an anti-infective drug rather than an antibiotic drug when treating a urinary tract infection? An anti-infective drug allows the body’s natural defenses to kill bacteria, thus helping the immune system get stronger. Antibiotic drugs kill only bacteria, so another drug would be needed to treat the UTI symptoms and end the infection. Anti-infective drugs can prevent the onset of a UTI because they block sodium and potassium from entering the blood and spreading bacteria. Antibiotic drugs help relieve pain by making parts of the body numb, but they do not remove the infection from the body.

In 2009, a flu pandemic was believed to have originated when viral transmission occurred from pig to human, thereby earning the designation, "swine flu." although pigs are thought to have been the breeding ground for the 2009 virus, sequences from bird, pig, and human viruses were all found within this newly identified virus. what is the most likely explanation of why this virus contained sequences from bird, pig, and human viruses? a) the virus was descended from a common ancestor of bird, pig, and human flu viruses.b) the infected individuals happened to be infected with all three virus types.c) related viruses can undergo genetic recombination if the rna genomes mix and match during viral assembly.d) the human was likely infected with various bacterial strains that contained all three rna viruses.