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Human papillomavirus infection (HPV infection) is caused by a DNA virus from the Papillomaviridae family. [5] Many HPV infections cause no symptoms and 90% resolve spontaneously within two years. [1] In some cases, an HPV infection persists and results in either warts or precancerous lesions. [2]
This is a timeline of the development of prophylactic human vaccines. Early vaccines may be listed by the first year of development or testing, but later entries usually show the year the vaccine finished trials and became available on the market. Although vaccines exist for the diseases listed below, only smallpox has been eliminated worldwide.
In 2010, Gardasil was approved by the FDA for prevention of anal cancer and associated precancerous lesions due to HPV types 6, 11, 16, and 18 in people aged 9 through 26 years. [37] HPV infections, especially HPV 16, contribute to some head and neck cancer (HPV is found in an estimated 26–35% of head and neck squamous cell carcinoma).
A study published in The Journal of Infectious Diseases in October 2012 found the prevalence of vaccine-preventable HPV types (6, 11, 16, and 18) in Papanicolaou test results of women aged 18–24 years has significantly decreased from 28.7% to 6.7% four years after the introduction of the National HPV Vaccination Program. [135]
Furthermore, the number of the week is one more than the actual age of the embryo/fetus. For example, the embryo is 0 whole weeks old during the 1st week after fertilization. The following table summarizes the various expression systems during week number x of gestation.
The purported scandal shocked the nation when it was reported that 18 high school girls in Gloucester, Mass., were all pregnant at the same time in 2008.
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Flu vaccine is recommended for anyone who is aged 65 years and over, people with certain long-term medical conditions, health and social care professionals, pregnant women, and poultry workers. [42] The shingles vaccine is recommended for those over 70. [39] Additionally, pregnant women are advised to have the pertussis vaccine. [43]