reproduce. The more there is the more likely they are to survive x
7
It is carried in air droplets so enters through the airway and then into the lungs where it thrives on warm, damp environment.
Active acquired immunity occurs when you get an infection by a pathogen (bacteria, virus) and your body responds and removes the pathogen and also your body makes "memory" cells. These cell remember this pathogen and when it enters your body again you remove it immediately. You are now immune to it. You usually don't notice this.
It is called a pathogen! it carries the bacteria fugus disease or whatever else into the body!
Yes, contagious diseases are infections. Infections are occur when a pathogen (germ) enters the body and reproduces.
Respiratory tract
A very broad answer to a very broad question... A "pathogen" as defined by a dictionary would be, "any disease-producing agent, esp. a virus, bacterium, or other microorganism." First- a "pathogen" in drinking water will cause nothing unless someone or something drinks the water or if the "pathogen" enters the body/host by some other means... Second- even once the "pathogen" enters the body it may still cause nothing, as the quantity of the "pathogen" must be sufficient to cause the would be disease... Third- because a "pathogen" could be any one of millions of things, what disease would be caused by your hypothetical "pathogen in the drinking water" would depend entirely on what it is... You should seriously consider being more specific about your question. If you are interested in a specific pathogen and the associated disease, please try again.
The pathogen tries to infect the body. The defense mechanism of the body resists the entry of the pathogen. If pathogen succeeds the infection is established and the body becomes sick.
The inflammatory response is the body's response to infection. After a pathogen enters the body and creates an infection, leukocytes rush to cite to kill off the bacteria. Inflammation results because of the puss that the body secretes to combat the bacteria. After the intruder is eliminated the body tries to heal the passage through which the pathogen entered, by closing it off and healing the skin.
During subsequent exposures to the same pathogen, the immune system is able to respond rapidly and activity reaches higher levels. The secondary immune responses can usually prevent disease, because the pathogen is detected, attacked and destroyed before symptoms appear.
After your first exposure to a pathogen, you have memory T-cells that will remember the antigen of the pathogen so in the future if you would come in contact with the same pathogen your body would recognize it right away and be able to kill it much faster.
Both are B-cells but plasma cells are the B-cells which acted on the pathogen the first time they invade the body while the memory cells are the B-lymphocytes that act on the antigen(pathogen) the second time it invades and when ever it invades the body again.Memory cells are much faster than plasma cells though plasma cells act very quickly on the pathogen once detected. but until it gets detected it needs time.Memory cells will work as soon as the pathogen enters the body before the person could even feel the symptoms.