# Avian Influenza H5N1 Infection During Pregnancy: Preparing for the Next Flu Pandemic and Improving Perinatal Outcomes

## TL;DR

This paper reviews how avian flu H5N1 could affect pregnant individuals and neonates, aiming to improve outcomes during a potential pandemic.

## Contribution

The paper provides a focused review on H5N1 infection during pregnancy, emphasizing perinatal risks and vaccine strategies.

## Key findings

- Pregnancy-related immune adaptations increase flu severity, including from H5N1.
- H5N1 poses specific risks to mothers and neonates, requiring tailored pandemic preparedness.
- Effective vaccine programs and peripartum care are critical for mitigating H5N1 risks in pregnancy.

## Abstract

Influenza (flu) is a common respiratory virus with seasonal global spread. Zoonotic viruses can occasionally cross species, leading to pandemic-level spread, and for flu viruses, this is considered an “antigenic shift”. The flu can be particularly severe during pregnancy due to immune system adaptations that occur during pregnancy, with prior global pandemics causing excess hospitalizations, deaths, and other complications in the mothers and the neonates. We aim to review the current literature with respect to novel avian H5N1 and the potential impact of infection with flu during pregnancy. A systematic literature search was conducted. Here we provide a rapid summary of epidemiology and understanding of viral spread, published risks of H5N1 in pregnancy, the unique physiologic, cellular, and molecular adaptations making H5N1 infection unique in pregnancy, implementation of an effective vaccine program in event of a pandemic specific to pregnant individuals, optimizing peripartum care for infected individuals, and direction for future research to direct vaccine strategy and mitigate risks in a future flu pandemic.