# Cases of high consequence infectious diseases identified in the UK, 1962–2023

## TL;DR

This paper summarizes the UK's experience with managing high consequence infectious diseases from 1962 to 2023, including patient outcomes and treatment details.

## Contribution

The paper provides a comprehensive summary of UK cases of high consequence infectious diseases over six decades.

## Key findings

- 26 patients were treated in HCID centers between 1962 and 2023 for diseases like Lassa fever and MERS.
- 15 additional HCID cases were identified but not treated in specialist centers due to various reasons.
- Most recent cases were related to early phases of public health emergencies like COVID-19 and mpox.

## Abstract

The management of patients with acute infectious diseases can present significant challenges, especially if the causative agent has a propensity for person-to-person transmission. In such cases, effective patient management is dependent on both rapid identification of disease and the provision of necessary medical care while adhering to suitable infection prevention and control measures to reduce the potential for onwards transmission. The UK has operated a defined system for managing patients with high consequence infectious diseases (HCIDs) since the 1970s, when protocols were first implemented following the first descriptions of several viral haemorrhagic fever diseases, including Marburg virus disease, Lassa fever and Ebola virus disease (EVD). While more than 200 people with HCIDs have been treated in UK hospitals since the 1970s, most of these patients had COVID-19 or mpox during the early phases of new public health emergencies of international concern (PHEICs), prior to their removal from the UK HCID list in March 2020 and June 2022, respectively. Excluding PHEICs, 26 patients have been treated in HCID treatment centres between 1962 and 2023: 10 patients with Lassa fever, 7 with mpox prior to the 2022 PHEIC, 4 with Middle East respiratory syndrome (MERS), 4 with EVD and 1 with Crimean-Congo haemorrhagic fever (CCHF). In total, 15 additional HCID patients were identified where treatment in a specialist centre did not occur due to retrospective diagnosis (4 patients with Lassa fever), mild or moderate illness [5 patients with avian influenza A(H5N1), 1 with MERS and 1 with CCHF] or death prior to transfer (2 patients with Lassa fever, 1 with CCHF and 1 with pneumonic plague). Here we summarize the UK HCID experience, including details about their detection, patient management and outcomes.