Chest infections rise in north India due to lesser-known bacterium: Study

A team at the Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, has reported a significant rise in infections caused by a lesser-known bacterium that mimics whooping cough in north India, officials said on Thursday.

Pertussis, commonly known as whooping cough, is a highly contagious respiratory illness that has historically been a major cause of childhood mortality, with fatality rates reaching 10 per cent in the early 20th century, a PGIMER statement noted.

The study, titled 'Emergence of Bordetella holmesiiAssociated Pertussis-Like Illness, Northern India, 20192023', was published in the Emerging Infectious Diseases journal (of the Centers for Disease Control and Prevention, USA) and analysed 935 suspected pertussis cases.

Researchers discovered that nearly 37 per cent of infections were caused by Bordetella holmesii (bacterium), surpassing the number of infections from Bordetella pertussis, which used to be relatively more common.

The most significant increase was recorded in 2023, predominantly among children aged 5-10 years in northern India, the statement said.

According to the data obtained under the ongoing surveillance programme at the PGIMER since 2015, the prevalence of B pertussis declined from 15-20 per cent to just 2-5 per cent, while infections from B holmesii rose markedly.

This shift signals an evolving pattern in the etiology of pertussis-like respiratory illness in the region, the statement said.

This long-term research was spearheaded by Dr Vikas Gautam's laboratory at PGIMER, in collaboration with Dr Prabhu Patil of the CSIR-IMTECH, Chandigarh, it said.

In Asia, pertussis continues to pose a significant public health burden, particularly in India and China, primarily affecting young infants and children, the PGIMER statement noted.

After a brief decline during the Covid-19 pandemic, the number of cases has sharply rebounded. India recently reported approximately 13.6 million cases, while China's incidence rose from 0.13 per 1,00,000 in 2013 to 2.15 per 1,00,000 in 2019, exceeding 58,990 reported cases by early 2024, it said.

The PGIMER team's findings underscore the institute's pivotal role in identifying emerging pathogens and follow the scientific team's earlier identification of stenotrophomonas sepilia, a new bacterium responsible for sepsis, it added.