[BCG vaccine administration schedule and primary immunodeficiencies: Is it time for a change?]

Area of Science:

• Immunology
• Vaccinology
• Public Health

Background:

• Patients with Primary Immunodeficiencies (PID) face severe risks from BCG vaccination.
• Chile's tuberculosis (TB) incidence is rising, necessitating a review of vaccination policies.
• Previous BCG schedule changes in similar countries did not increase severe TB cases.

Purpose of the Study:

• To critically analyze the optimal timing for BCG vaccine administration in Chile.
• To assess the risk-benefit balance of universal BCG vaccination for newborns.
• To consider the implications of widespread neonatal PID screening.

Main Methods:

• Review of epidemiological data on TB incidence in Chile.
• Analysis of BCG vaccination schedules in comparable countries.
• Evaluation of the feasibility and impact of neonatal PID screening.

Main Results:

• BCG vaccination poses a significant risk of severe complications for individuals with PID.
• Adjusting BCG vaccination schedules can mitigate risks without compromising TB prevention.
• Neonatal PID screening is technically feasible and could inform vaccination timing.

Conclusions:

• Chile should reassess its BCG vaccination schedule in light of rising TB cases and PID risks.
• Implementing neonatal PID screening can enable safer vaccination strategies.
• Evidence from other nations suggests schedule modifications are viable and beneficial.