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Pakistan is experiencing the first known outbreak of extensively drug-resistant (XDR)  Salmonella enterica  serotype Typhi (resistant to third-generation cephalosporins). The outbreak originated in Hyderabad in 2016 and spread throughout the Sindh Province. Whereas focus has remained on Sindh, the burden of XDR typhoid in Punjab, the most populous province, and the rest of the country is understudied. Using laboratory data from Shaukat Khanum Memorial Cancer Hospital and Research Centre in Lahore (Punjab Province) and its network of more than 100 collection centers across the country, we determined the frequency of blood culture–confirmed XDR typhoid cases from 2017 to 2019. We observed an increase in XDR typhoid cases in Punjab, with the percent of ceftriaxone resistance among  Salmonella  Typhi cases increasing from no cases in 2017, to 30% in 2018, and to 50% in 2019, with children bearing the largest burden. We also observed spread of XDR typhoid to the two other provinces in Pakistan. To assess prevailing knowledge and practices on XDR typhoid, we surveyed 321 frontline healthcare workers. Survey results suggested that inappropriate diagnostic tests and antibiotic practices may lead to underdiagnosis of XDR typhoid cases, and potentially drive resistance development and spread. Of those surveyed, only 43.6% had heard of XDR typhoid. Currently, serological tests are more routinely used over blood culture tests even though blood culture is imperative for a definitive diagnosis of typhoid fever. We recommend stronger liaisons between healthcare providers and diagnostic laboratories, and increased promotion of typhoid vaccination among healthcare workers and the general population.

the american journal of tropical medicine and hygiene

Continued Outbreak of Ceftriaxone-Resistant Salmonella enterica Serotype Typhi across Pakistan and Assessment of Knowledge and Practices among Healthcare Workers