The vaccine uses same technology as Hib vaccine. The vaccine is new but the constituents are not and have been used for a number of years. The vaccine has an excellent safety profile. Studies show the vaccine is well tolerated with no serious side effects. Rates of local and systemic reactions similar to those seen with Hib vaccine.
Most common reactions are redness and swelling at injection site and mild fevers.
There is no evidence of 'immunological overload' from the addition of the new meningitis vaccine with all of the vaccines tested.