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At about 2 to 8 months of age
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Why don't microbes become covered in antibodies as soon as they are found?
the blood cycles round the body one way so the antibodies have to go all the way around the body until they get to the microbe which could take a long time.
In which animal have blue blood?
All mammals have bluish blood until it is oxygenated. That's one reason why veins appear blue.
What will happen if blood group A transmitted to blood group B?
The very short answer is, badness shall ensue. People with type B blood often have circulating antibodies in their blood stream against type A antigens. If you give a person with type B blood an infusion of type A red blood cells, the person will have a transfusion reaction during which their anti-A antibodies will destroy all the red blood cells you just infused. This can be lethal, and until blood typing was well understood this often happened.
What doesn't usually appear in humans until around the ages of 2-6?
The teeth.
What produces antibodies to remove foreign invaders?
Antibodies are produced in a White blood cell called a plasma cell. The antibody is made for a specific type of pathogen which it recognises by it's antigen. The antibody will link on to the pathogen and either destroy it or hold on to it until another White blood cell will come and ingest (eat) it.
Can HIV be detected within a month of being infected?
Yes, it is possible. However, in many cases, the antibodies to the HIV virus do not appear until well past a month. The window period for the HIV can be anywhere between 2 weeks to 6 months. Any test done during this window period should be repeated so as to assure accuracy.
Why does it take 3 months until you find out hiv in your blood?
Because your body takes time to develop antibodies. Modern HIV tests (called fourth generation tests) can detect 95% of infections by about four weeks.
How is it that an incompatible ABO blood group will generate a transfusion reaction the first time a transfusion is given while Rh incompatibility creates a problem the second time?
The antigens of the ABO system are mimicked by bacterial cell walls. So if your body does not actively suppress antibodies to them (because you have them) then antibodies will form over time to the ones you so not have (A or B or both). The rhesus factor (Rh) is not mimicked in nature and so antibodies are not formed in Rh negative people until after an exposure - usually when an Rh negative women carries an Rh positive child. If the person is Rh positive then antibodies will not form no matter what.
What kind of cell can engulf bacteria or make antibodies?
Inside the human body, a particular type of white blood cell called a macrophage will engulf and digest bacteria.
Why there are no blood tests for tetanus?
Could be because kids get vaccinated for it today and it's still rare. When someone steps on a nail or something we are usually real quick with getting a shot. The level of antibodies can be measured with a blood test and sometimes they do that to see how much protection is still there. When ppl do get tetanus they don't get it diagnosed until they come in with symptoms and by then the doctor already knows.
When does enlarged prostate show up?
Significant enlargement and symptoms usually do not appear until after age 50
Why does erythroblastosis fetalis occur with a second pregnancy and normally not the first pregnancy?
The mother is exposed to fetal blood during childbirth or abortion. The Rh+ proteins on the surface of fetal erythocytes can trigger an immune response in the mother. This creates antibodies in the mother and memory lymphocytes that are able to create more antibodies. In the second pregnancy with a fetus with Rh factor, the antibodies in maternal blood can cross the placenta to the fetus and attack the fetus's erythocytes to cause erythroblastosis fetalis. The maternal blood in the first pregnancy does not contain such antibodies to cause the problem because the mother has never been exposed to the Rh factor until the time of first childbirth with the antigen.
