Many diseases are caused by harmful bacteria or viruses, they are called germs. They can be found in plants, animals and people, and sometimes they cause disease. Bacteria are tiny, single-celled creatures that draw their nutrients from the surrounding environment to survive.

Infections are an invasion and multiplication of pathogens in the tissues of an organism, the body, which causes a disease. I. is defined as a disease that comes from the Latin infirmitas, and literally means "lacking firmness".

The definition of disease is that of alteration or deviation from normal of the physiological state in one or more parts of the body, because of generally known causes. It manifests characteristic symptoms and signs, and its evolution is more or less predictable.

Germs can be passed from person to person by coughing, sneezing, or shaking hands. Germs can also be spread by touching something that has been touched by an infected person, such as table surfaces, work desks, or pets. It can also be passed through contaminated food or drinks. Infection-bearing animals or insects, are not a factor in Covid-19.

Diseases spread, spread, and are passed from one person to another, the contagion occurs in times or periods of incubation, the period before the person shows symptoms and realizes that he is ill. Therefore, health and safety precautions must be practiced at all times to reduce the risk of contagion or the spread of disease.

"When another finds things almost too confusing and difficult to bear, when his or her wits are going around and around, get the person to just stand back and look." L. Ronald Hubbard. www.thewaytohappiness.org @waytohappiness