common diseases in humans
disease-causing organisms like bacteria
virus fungi and protozoa etc a cold pathogens all parasites are therefore pathogens can enter our body by various means multiply and interfere with normal vital activities resulting in morphological and functional damage since pathogens are parasites they cause harm to the host leading a diseased state let us observe some of the common diseases bacterial diseases typhoid typhoid is an acute infectious disease pathogen Salmonella typhi mode of transmission the pathogen enters the small intestine through contaminated food and water symptoms high fever weakness stomach pain headache constipation loss of appetite prevention proper sanitation drinking purified water protection of food from contamination by flies vaccine ta be typhoid paranoid a and B provides protection against typhoid fever can be confirmed by we don't test pneumonia pathogen streptococcus pneumonia in fact are really of lungs leading to respiratory problems symptoms fever cough and headache etc in severe cases the lips and fingernails may turn gray to bluish in the color mode of transmission droplets released by an infected person or sharing glasses or utensils with an infected person viral diseases common cold is an infectious disease pathogen rhinoviruses the mucous the membrane of the upper respiratory tract that is nose and throat gets infected symptoms nasal congestion and discharge so throat cough headache wholeness tiredness etc mode of transmission droplets from cough or sneeze of an infected person are either inhaled directly or through contaminated objects such as pens books cups doughnuts computer key boat or mouse etc can cause infection in a healthy person
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