Question: Who is most endangered by live vaccines?
About the article "Virus", section "Vaccines".

Candidate passages:
Vaccination is a cheap and effective way of preventing infections by viruses.
Vaccines were used to prevent viral infections long before the discovery of the actual viruses.
Their use has resulted in a dramatic decline in morbidity (illness) and mortality (death) associated with viral infections such as polio, measles, mumps and rubella.
Smallpox infections have been eradicated.
Vaccines are available to prevent over thirteen viral infections of humans, and more are used to prevent viral infections of animals.
Vaccines can consist of live-attenuated or killed viruses, or viral proteins (antigens).
Live vaccines contain weakened forms of the virus, which do not cause the disease but, nonetheless, confer immunity.
Such viruses are called attenuated.
Live vaccines can be dangerous when given to people with a weak immunity, (who are described as immunocompromised), because in these people, the weakened virus can cause the original disease.
Biotechnology and genetic engineering techniques are used to produce subunit vaccines.
These vaccines use only the capsid proteins of the virus.
Hepatitis B vaccine is an example of this type of vaccine.
Subunit vaccines are safe for immunocompromised patients because they cannot cause the disease.
The yellow fever virus vaccine, a live-attenuated strain called 17D, is probably the safest and most effective vaccine ever generated.
Protection is offered by commercial feline distemper vaccines (ATCvet codes: for the inactivated viral vaccine and for the live vaccine).
A number of combination vaccines for several different diseases, including panleukopenia, are also available. 
A rotavirus vaccine protects children from rotaviruses, which are the leading cause of severe diarrhea among infants and young children.
Each year an estimated 453,000 children die from diarrhoeal disease caused by rotavirus, most of whom live in developing countries, and another two million are hospitalised.
Rotavirus is highly contagious and resistant and, regardless of water quality and available sanitation nearly every child in the world is at risk of infection.
There are two effective rotavirus vaccines: Rotarix by GlaxoSmithKline and RotaTeq by Merck.
A vaccine has recently been developed in India.
Phase III trials have been conducted for the vaccine.
On June 5, 2009, the World Health Organization (WHO) recommended that rotavirus vaccine be included in all national immunization programs.
The "Rotavirus Vaccine Program" and the Accelerated Vaccine Introduction initiative have worked to study rotavirus vaccines among developing-country populations to assist developing countries in introducing rotavirus vaccines into routine immunization programs.
These partnerships are spearheaded by international non-governmental organization PATH, WHO, the U.S. Centers for Disease Control and Prevention, and the Global Alliance for Vaccines and Immunization. 
Prevention and treatment of viral disease in humans and other animals.
Vaccination is a way of preventing diseases caused by viruses.
Vaccines simulate a natural infection and its associated immune response, but do not cause the disease.
Their use has resulted in a dramatic decline in illness and death caused by infections such as polio, measles, mumps and rubella.
Vaccines are available to prevent over thirteen viral infections of humans and more are used to prevent viral infections of animals.
Vaccines may consist of either live or killed viruses.
Live vaccines contain weakened forms of the virus, but these vaccines can be dangerous when given to people with weak immunity.
In these people, the weakened virus can cause the original disease.
Biotechnology and genetic engineering techniques are used to produce "designer" vaccines that only have the capsid proteins of the virus.
Hepatitis B vaccine is an example of this type of vaccine.
These vaccines are safer because they can never cause the disease. 
Live virus reference strain (LVRS) refers to a common strain of a virus that is selected for the manufacture of a preventative vaccine.
It is most commonly used in reference to the seasonal Influenza vaccines developed by the Centers for Disease Control every year.
However, it can also refer to other virus strains.