# Necrotizing Pneumonia in a Vaccinated Child: A Rare Complication of Viral and Bacterial Co-infection

## TL;DR

A vaccinated child developed necrotizing pneumonia from a viral and bacterial co-infection, showing the condition can occur even in immunized children.

## Contribution

Highlights necrotizing pneumonia as a rare complication in vaccinated children due to viral-bacterial synergy.

## Key findings

- Necrotizing pneumonia occurred in a fully vaccinated child with no underlying health issues.
- Viral-bacterial co-infection was identified as a contributing factor despite negative blood and pleural fluid cultures.
- Surgical intervention improved the child's condition, emphasizing the need for timely multidisciplinary care.

## Abstract

Necrotizing pneumonia is a rare but serious complication of community-acquired pneumonia in children, often associated with parenchymal destruction, cavitation, and empyema. Despite the availability of pneumococcal conjugate vaccines, necrotizing pneumonia may still occur in immunized and otherwise healthy children due to non-vaccine serotypes or viral-bacterial co-infections.

We report the case of a three-year-old developmentally normal female child who had received all age-appropriate immunizations, including three doses of the pneumococcal polysaccharide conjugate vaccine (13-valent, adsorbed; Prevnar), and presented with fever, tachypnea, and chest retractions. Initial evaluation revealed severe anemia, marked leukocytosis, and a significantly elevated C-reactive protein level. Imaging demonstrated bilateral lower lobe consolidation with cavitations and a right-sided loculated pleural effusion. Respiratory viral panel testing was positive for influenza A, parainfluenza, and rhinovirus, while pneumococcal antigen was detected in pleural fluid. Blood and pleural fluid cultures were negative, and pleural fluid analysis was consistent with an exudate showing neutrophilic predominance.

The child received broad-spectrum antimicrobials along with oseltamivir, but persistent fever and respiratory distress necessitated surgical management. On the third day of admission, video-assisted thoracoscopic surgery with decortication was performed, revealing thick pleural peel and pus collections. Following surgery, the child showed progressive clinical improvement with resolution of fever, decreasing inflammatory markers, and expansion of the lung. She was discharged hemodynamically stable on oral medications.

This case highlights the importance of early recognition of necrotizing pneumonia even in vaccinated and immunocompetent children. Viral-bacterial synergy plays a significant role in disease progression, and negative cultures should not delay diagnosis when supported by clinical, radiological, and antigen test findings. Prompt multidisciplinary care and timely surgical intervention remain crucial for favorable outcomes.