Explore Explore Science Let’s PUBLISHING ROURKE SHIRLEY DUKE www rourkepublishing com INFECTIONS INFESTATIONS AND DISEASES
Chapter 1 HEALTH AND ILLNESS means being free of disease or pain Health can refer to the mind spirit and body A body that is healthy Health Health can function properly Muscles organs and other systems all work together to help a person live day-to-day life with relative ease Bodily health is sometimes taken for granted that is until someone gets sick What are the different ways a person can become sick Healthy bodies and minds help kids do well in school 4
One way a person can get sick is by getting an infection An infection is a growth of germs called pathogens that causes illness Signs that infection has entered the body include redness swelling warmth or pain Rashes swollen glands in the neck a high fever a cough and chills are also symptoms of infection Pathogens that cause infections are usually bacteria or viruses Bacteria are one-celled organisms that live almost everywhere They are too small to be seen without a microscope Many kinds of bacteria do not cause someone to get sick Some kinds of bacteria actually help people These good bacteria protect the body by fighting off harmful bacteria 5
