Types rubella (MMR combined vaccine) 3.Varicella (chickenpox) 4.Influenza

Types of Vaccines

1. Vaccinia (smallpox) 2.Measles, mumps, rubella (MMR
combined vaccine)

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3.Varicella (chickenpox) 4.Influenza (nasal spray)
5.Rotavirus.

6.Zoster (shingles) 7.Yellow fever.

There are many other types of the vaccines like

Hepatitis A,B etc

Polio

Flu

Measles

Mumps

Shingles

RetroVirus

Chicken Pox

Yellow Fever

Rebella etc

Scientists take many approaches to designing vaccines. These
approaches are based on information about the germs (viruses or bacteria) the
vaccine will prevent, such as how it infects cells and how the immune system
responds to it. Practical considerations, such as regions of the world where
the vaccine would be used, are also important because the strain of a virus and
environmental conditions, such as temperature and risk of exposure, may be different
in various parts of the world. The vaccine delivery options available may also
differ geographically. Today there are five main types of vaccines that infants
and young children commonly receive: • ­Live, attenuated vaccines fight
viruses. These vaccines contain a version of the living virus that has been
weakened so that it does not cause serious disease in people with healthy
immune systems. Because live, attenuated vaccines are the closest thing to a
natural infection, they are good teachers for the immune system. Examples of
live, attenuated vaccines include measles, mumps,

In other cases, such as the DTaP vaccine, which protects
against diphtheria, tetanus, and pertussis, the initial series of four shots
that children receive as part of their infant immunizations helps them build
immunity. After a while, however, that immunity begins to wear off. At that
point, a “booster ” dose is needed to bring immunity levels back up. This
booster dose is needed at 4 years through 6 years old for DTaP. Another booster
against these diseases is needed at 11 years or 12 years of age. This booster
for older children and teens and adults, too is called Tdap. • For some
vaccines (primarily live vaccines), studies have shown that more than one dose
is needed for everyone to develop the best immune response. For example, after
one dose of the MMR vaccine, some people may not develop enough antibodies to
fight off infection. The second dose helps make sure that almost everyone is
protected. • Finally, in the case of the flu vaccine, adults and children
(older than 6 months) need to get a dose every year. Children 6 months through
8 years old who have never gotten the flu vaccine in the past or have only
gotten one dose in past years need two doses the first year they are vaccinated
against flu for best protection. Then, annual flu shots are needed because the
disease-causing viruses may be different from year to year. Every year, the flu
vaccine is designed to prevent the specific viruses that experts predict will
be circulating

There are many diseases which can not have vaccines like
HIV/AIDS

Mechanism of the Vaccine Action

                 
Vaccines help the develop of the immunity by imitating the infection.
This type of infection, however, does not cause illness, but it does cause the
immune system to produce T-lymphocytes and antibodies. Sometimes, after getting
a vaccine, the imitation infection can cause minor symptoms, such as fever.
Such minor symptoms are normal and should be expected as the body builds
immunity. Once the imitation infection goes away, the body is left with a
supply of “memory” T-lymphocytes, as well as B-lymphocytes that will remember
how to fight that disease in the future. However, it typically takes a few
weeks for the body to produce T-lymphocytes and B-lymphocytes after
vaccination. Therefore, it is possible that a person who was infected with a
disease just before or just after vaccination could develop symptoms and get a
disease, because the vaccine has not had enough time to provide protection.

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