neonatology Vaccination in the premature babies

Vaccination plays a crucial role in protecting infants against life-threatening infectious diseases, and its importance is even greater in premature babies. Premature infants are born with an immature immune system, reduced maternal antibody transfer, and a higher susceptibility to infections. Despite these vulnerabilities, research and clinical experience show that vaccines are both safe and effective in this population when administered according to recommended schedules. One of the key principles is that vaccines should be given according to the infant's chronological age, not corrected gestational age. This ensures timely protection during the critical first months of life. For example, routine immunizations against diphtheria, pertussis, tetanus, polio, Haemophilus influenzae type b, pneumococcus, and hepatitis B should not be delayed solely due to prematurity. In fact, delaying vaccination increases the risk of severe infections and hospitalization. Special considerations may apply in some cases. Very low birth weight infants or those with unstable clinical conditions may require closer monitoring after vaccination, particularly for apnea or bradycardia events. Influenza and RSV prevention strategies are also especially important in this group. In premature infants, Inogen is weaker than the hepatitis B vaccine. Infants weighing less than ۲ kg at birth should receive an additional dose of hepatitis B vaccine at one month of age if they received the first dose of hepatitis B at birth. In the routine infant vaccination program in Iran, since the ۵-dose vaccine is administered, all term and premature infants receive four doses of the hepatitis B vaccine. Respiratory syncytial virus (RSV) poses a serious threat to premature infants, often leading to severe bronchiolitis or pneumonia. Protection can be achieved through passive immunization with monoclonal antibodies, such as palivizumab or the newer long-acting nirsevimab, especially during RSV season. In addition, maternal vaccination during pregnancy and strict infection control measures help reduce the risk of RSV infection in this highly vulnerable group. Evidence consistently demonstrates that premature infants mount adequate immune responses to most vaccines, though antibody titers may be lower compared to term infants. Booster doses help ensure long-term protection. Parents should be reassured that side effects are generally mild and similar to those seen in term infants. In conclusion, vaccination of premature babies is essential, safe, and lifesaving. Timely administration without unnecessary delays should be the standard of care. Healthcare professionals must provide guidance and support to families, emphasizing the protective value of vaccines in safeguarding these vulnerable children.