The sick asthmatics' breath is 5, as soon as they improved with the cortisone-type injections, their breath acidity was neutralized at 7. Acid is a body defense mechanism to help you kill germs. For example, dogs can eat all kinds of infected foods that you can't because their stomachs are so acidic, they can kill germs in their stomach that your stomach couldn't possibly tolerate. Perhaps the lungs also kill germs in the same way with acid that your stomach does. Everyone agrees that there is a definite increase in the incidence of asthma over the last 100 years, the same span on time in which our ability to control infections has expanded miraculously.
Doctors give immunization injections to prevent disease.
They prescribe antibiotics to shorten the duration of infections. You wash your hands to reduce your exposure to germs. You learn to stay away from someone who has a cold. Your food contains fewer germs than ever before. You clean your environment and so forth.