Measles, also known as rubeola, not to be confused with rubella, is a disease caused by a virus of the genus Morbillivirus. Measles was long considered a normal childhood disease, but the virus can cause severe complications in otherwise healthy children and adults, including sometimes-fatal encephalitis, pneumonia and diarrhea. Only 37 measles cases were reported in the United States in 2004. But a few cases are still imported from countries with lower vaccination rates and the disease occurs domestically as well. Most developed countries routinely vaccinate children against measles but the virus still killed 500,000 people, mostly children, around the world in 2003, according to the World Health Organization.
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History of Measles in USA
Before measles vaccination was introduced in the United States in
the mid-1960s, more than half a million cases of measles were reported
each year. By the mid-1970s, fewer than 50,000 cases were being reported
annually in the United States, but a severe outbreak in Los Angeles in
1977 led to compulsory immunization of schoolchildren. A second dose
of measles vaccine was introduced in 1989. In March 2000, it was announced
that measles was no longer endemic in the USA. However, a 2005 measles
outbreak occurred in Indiana when a 17-year-old girl who was incubating
measles returned to Indiana from Romania, the outbreak ultimately involved
at least 34 persons, 1 of whom had life-threatening illness.
From January to July 2008, a total of 131 measles cases were
reported to the U.S. Centers for Disease Control and Prevention, the
highest number seen during the same 7-month period since 1996.
Measles Infection
Measles is an acute infectious disease that can affect persons of
all ages but is most severe in young infants and adults. Person-to-person
transmission occurs through direct contact or droplet spread. Infected
persons can infect others during the prodromal period before the
characteristic rash appears, creating ample opportunity for people who are
incubating the disease to travel from a country where the virus is
circulating.
Measles Vaccination
In the United States, measles vaccine is delivered in combination
with mumps and rubella vaccines. Although the two-dose strategy ensures
that a high proportion of those who are vaccinated will be immune to
measles (seroconversion after two doses of vaccine is estimated to be 98
percent), the conversion rate is lower for mumps (approximately 88
percent). Thus, the proportion of persons in a U.S. community who are
susceptible to mumps is greater than the proportion who are susceptible to
measles, and outbreaks, when they occur, will be larger.
Spread of Measles
Measles is spread through respiration (contact with fluids from an infected person's nose and mouth, either directly or through aerosol transmission), and is highly contagious - 90% of people without immunity sharing a house with an infected person will catch it. Airborne precautions should be taken for all suspected cases of measles. The incubation period usually lasts for 10-12 days (during which there are no symptoms). Infected people remain contagious from the appearance of the first symptoms until 3-5 days after the rash appears.
High vaccination coverage rates and the administration of a second dose of measles vaccine have resulted in a significant decline in the incidence of measles and neurologic diseases due to measles in many countries. However, intermittent outbreaks of measles still occur even in countries with excellent vaccination coverage, suggesting the existence of high rates of measles virus introduction from endemic regions and/or waning of vaccine-induced immunity.
Measles Statistics
Worldwide measles deaths dropped 48 percent in six years as immunization
efforts reached more children in sub-Saharan Africa. The World Health
Organization (WHO) and U.N. Children's Fund (UNICEF) said the fall in
deaths to 454,000 in 2004 from 871,000 in 1999 was "an outstanding public
health success story". A safe, cheap and effective measles vaccine has
been available since the 1960s, but the highly infectious disease is still
a major killer of children in developing countries. About 410,000 children
under the age of 5 died from measles in 2004, many from complications
related to severe diarrhea and pneumonia, the U.N. agencies said in a
joint statement.
Measles deaths drop
January 2007 - Deaths from measles have fallen by 60 percent worldwide
since 1999 in what experts described on Friday as an historic victory for
global health. Accelerated control measures including an increase in
routine measles immunizations and a campaign to reach marginalized
children in the 45 worst hit countries has pushed deaths down from an
estimated 873,000 in 1999 to around 345,000 in 2005. The biggest fall has
been in Africa where the number of children dying from measles fell 75
percent to 126,000.
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Measles in Boston
The city
reported the first outbreak of measles in seven years after four people in a
downtown office tower were diagnosed with the highly infectious disease. The
Boston Public Health Commission opened a second emergency health clinic in May
2006 at the 60-story John Hancock Tower after it became known that hundreds of
workers may be at risk of developing measles. The four who were diagnosed with
the disease all worked at Investors Bank & Trust, a financial services firm.
Three of the workers caught the disease from a contract worker who recently
traveled from India.