On 21/11, the World Health Organization (WHO) released an updated position paper on the chickenpox vaccine, replacing the version issued in 2014. The new document synthesizes recent scientific evidence, vaccine efficacy data, and implementation experiences from various countries, providing adjusted recommendations suitable for the current context.

A key update in the guidelines is the confirmation that the MAV/06 strain is equivalent to the Oka strain, which has been the standard virus strain in many existing chickenpox vaccines. WHO assesses that this recognition expands the global vaccine supply for countries and allows the MAV/06 strain to be integrated into current worldwide immunization schedules.

The guidelines also underscore the effectiveness of a two-dose chickenpox vaccine schedule. According to WHO, while one dose can provide good protection, two doses create a more optimal and sustainable immune response. This two-dose schedule has already been adopted by many nations, including the United Kingdom.

Regarding public health strategy, WHO continues to affirm that vaccination is the main measure to reduce severe chickenpox cases and limit complications, especially in children. The organization supports countries in incorporating the chickenpox vaccine into their expanded immunization programs in areas where the disease remains a significant burden.

The new document updates the 2014 guidelines by incorporating new scientific evidence and practical experiences from health systems in various countries, aiming to help nations develop more appropriate and effective immunization policies.

The Dan