Disease transmission
Pathogens biological or germs
· Virus: Although there are real living beings, they are supramolecular organizations are included within biological pathogens. The virus, to enter into a living organism, become obligate intracellular parasites, ie they have no metabolism outside a living cell. For example, influenza and AIDS.
· Bacteria: are single-celled prokaryotes (ie, cells lacking a distinct nucleus). For example, cholera or tuberculosis.
· Some protozoa, unicellular eukaryotes (ie, their cells have nuclei). For such as malaria.
· Metazoans : mites such as those produced scabies, worms that cause trichinosis and hydatid disease, disease-causing fungi such as athlete's foot.
physical and chemical pathogens
produce poison for entry into the body of poisons , by eating spoiled food, or stings or bites from animals such as snakes.
Pathogens psychological, social and cultural
Changes in the values \u200b\u200band customs, the pace of life, wars, economic problems, job opportunities, unemployment, racial and religious discrimination ... provide a wide range of factors that are of great importance in human health as extremely negative impact on general welfare.
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