Fetal in is not out living Yu amniotic membrane within was is good of protection, apart from minority some congenital infection of microbial, can through placenta infection fetal outside, normal situation Xia amniotic membrane within is no bacteria of State, therefore fetal this during is most security of; once breaking water or was born Hou on exposure out territories of environment in the, began and many microbial occurs contact, on has opportunities occurs infection disease.
Baby born after facing crisis of microbial infection, how to resolve? At this point the body\'s immune system plays an important role.
There are many bacteria in the gastrointestinal tract, bacteria can produce useful substances on the one hand, improve the health of the human body, on the other hand bacteria can also be achieved by the health of the gastrointestinal tract nutrition, reach a mutual benefit of the State, this is the perfect combination between man and microbes. Another way is symbiosis, microorganisms in the human body only achieved survival and reproduction of nutrients, and won\'t make people any indications or disease, enter the total outside the realm of peace. Finally a way is a parasitic microorganisms in the human body in addition to nutrients, but also damage to human organs must, have a disease, even death, as against their fatal embrace.
Resistance to microbial invasion
Something foreign has the ability to identify the human body, as long as it is not part of your body will be eradication of exclusion, which is immune. Human immune system to distinguish between two broad line of Defense, the first line of Defense is broader and less comprehensive, identification capacity than it started very quickly, can effectively block most of the microbial invasion, such as skin, Mucosa, complement and Phagocytic white blood cells, and so this is non-specific defense mechanism.
After the second line of Defense is usually the microbial invasion, the first line of Defense when it cannot stop abatement, second line of Defense is needed to participate in, their identification and mitigation ability is strong, but starts slow, usually takes a few days \' time, to achieve the best results. Once started, the actions will produce memory, if the next time the same microbial invasion of the body, immune system immediately by memory immediately subtracted invading microbes and disease does not occur. This immunity include special lymphocytes, and secreted by immune substances.
Understanding of immune function
Based on previous experience found some infection, life will be once too won\'t be infected, such as measles, chicken pox and other diseases. After some study found that people were infected after, will have some substance in the blood and toxins released by bacteria known as the \"anti-toxin\"; or produce some specificity protein to combat bacteria, which came to be known as \"antibody\" things. Later, humans begin to understand the immune system for infections caused by micro-organisms are resistant to, you can prevent infected again.
Human immunity is innate, depending on the parents \' genes, could not be changed; but sometimes can occur because the gene mutation and millions of immune gene changes, problems with the immune function. But human again after a few decades, may for many immune system gene and its effect to understand more clearly, when the lack of some of the innate immune system diseases, there may be a treatment method, can even be developed to strengthen functions of drug, the body resistance to microbes has strong.
Vaccines and vaccinations
The earliest historical records and use in human vaccines is in China around 1100, after smallpox scab has also be ground into powder by the nostrils inhalation to prevent smallpox records. In around 1721, United Kingdom a physician Jenner discovered many milk the workers rarely had smallpox, in spite of smallpox, symptoms are mild, so think after contact with bovine smallpox, could have a preventive effect, after many experiments, Vaccinia vaccine was invented in 1796.
In around 1870, the French Pasteur also made some can counteract bacterial or viral vaccines, marked a new era of vaccination and vaccine manufacturing. Vaccines that were invented after the decline in the incidence of many infectious diseases, saved many lives, which smallpox to the 1978 or even on Earth has disappeared, it is entirely dependent on success of vaccines and vaccination.
Principles of vaccination is produced when the body\'s immune system against alien invasive microbial reactions. As long as these organisms are modified into injurious Antigen after, enter the body through different inoculation methods and make its specificity and effectiveness of the immune response, the specific identification of microorganisms with ability can, once again encounters these microbes can immediately be subtracted without infection, achieve the purpose of prevention.
So parents on human immune function and awareness of the principles should be further vaccination, should also be more acceptable for one\'s own baby vaccinated. After all, prevention is better than cure truth is unchanged.
