A vaccine was introduced in the past (RotaShield) to prevent rotavirus
infection; however it had to be withdrawn since 1 out of 10000 infants
administered the vaccine suffered a serious complication called intussusception
. Intussusception is a condition where a part of the intestine
moves over the other like a telescope.
Rotavirus vaccine causes inflammation in parts of the intestine as an
initial reaction. These points could be
vulnerable to intussusceptions.
Following this, two new
vaccines were approved to prevent Rotavirus infection - RV5 and RV1.
Researchers recently conducted a study to determine the incidence of
intussusceptions with a Rotavirus vaccine RV1 in Mexico and Brazil between the
years 2008 and 2010. They found that
there was an increase in intussusceptions cases after the first or second dose
of the vaccine in Mexico and after the second dose in Brazil. Intussusception
was seen in approximately 1 per 51,000 infants in Mexico and approximately 1
per 68,000 infants in Brazil. Five
infants died due to the complication.
Though the risk for
intussusceptions with the vaccine is real, the researchers feel that the risk
is too low and draw our attention to the benefits of the vaccine. According
to them, the vaccine prevented approximately 80,000 hospitalizations and 1300
deaths from diarrhea each year in these countries.
The researchers also
feel that the risk for intussusception is short term and advise continued use
of the vaccine.
Manish M. Patel et al.
Intussusception Risk and Health Benefits of Rotavirus Vaccination in
Mexico and Brazil. N Engl J Med 2011;