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If there are time constraints and both vaccines are necessary , the injections can be administered simultaneously or within a 3-week period with the understanding that antibody response may not be optimal . Backordered : this vaccine is recommended , in addition to the pneumococcal conjugate vaccine , for children aged 2 years up to the 19th birthday who meet the following high risk criteria : asplenia , sickle cell disease , nephritic syndrome ; cerebral spinal fluid leaks ; immunosuppression ; children living in special environments or social settings with an identified increased risk of pneumococcal disease or its complications ( e.g ., certain Native American populations ) . Smallpox can be prevented through use of the smallpox vaccine , even if the vaccine is given within three days after exposure to smallpox . Because the vaccine is inactive , it is safe for pregnant women and people with immune deficiencies . So , the reports of large-scale pertussis outbreaks in the United Kingdom since the vaccine was made optional seem to me a convincing argument against vaccinating anybody , even those who desire it , because if the vaccine produces authentic immunity , then this rebound phenomenon should not occur . The vaccine is made from a virus called vaccinia , which is another pox-type virus related to smallpox . No. They immediately invited a whole battery of reporters and photographers to be present when the vaccine was delivered to the official , and they made the presentation with much ceremony and solemnity , making a great to do about the vaccine . Because this is the first time this vaccine will be administered to humans , our main goal is to make sure this vaccine is safe . This vaccine is licensed only for use as the fourth and fifth doses for children who have previously been vaccinated against diphtheria , tetanus , and pertussis with three doses of whole-cell diphtheria and tetanus toxoids and pertussis vaccine ( DTP ) . Children today receive more vaccinations , but the amount of antigen ( substance that causes an immune response ) in each vaccine is less than those given in earlier years . Even in people with a weaker response , the vaccine is usually protective against serious flu complications , particularly pneumonia , if such people get the flu . If the first symptom of these injuries / conditions occurs within the listed time periods , it is presumed that the vaccine was the cause of the injury or condition unless another cause is found . The vaccine is preserved with thimerosal . A prototype of this vaccine is being tested in vivo at the Veterinary School . Children were regarded as vaccinated appropriately for age if the vaccine was administered up to one month after the recommended age . Both vaccines are safe and reduce disease occurrence . A 3 week minimum interval between cholera and yellow fever vaccines is recommended except in those cases where both vaccines are required and time constraints exist . In addition , the vaccine was proven to prevent or substantially lessen infection when given within a few days of exposure .