Public Health England Downgrades COVID-19

Date:

Last updated 21 March 2020 — see all updates

Status of COVID-19

As of 19 March 2020, COVID-19 is no longer considered to be a high consequence infectious diseases (HCID) in the UK.

The 4 nations public health HCID group made an interim recommendation in January 2020 to classify COVID-19 as an HCID. This was based on consideration of the UK HCID criteria about the virus and the disease with information available during the early stages of the outbreak. Now that more is known about COVID-19, the public health bodies in the UK have reviewed the most up to date information about COVID-19 against the UK HCID criteria. They have determined that several features have now changed; in particular, more information is available about mortality rates (low overall), and there is now greater clinical awareness and a specific and sensitive laboratory test, the availability of which continues to increase.

The Advisory Committee on Dangerous Pathogens (ACDP) is also of the opinion that COVID-19 should no longer be classified as an HCID.

The need to have a national, coordinated response remains, but this is being met by the government’s COVID-19 response.

Cases of COVID-19 are no longer managed by HCID treatment centres only. All healthcare workers managing possible and confirmed cases should follow the updated national infection and prevention (IPC) guidance for COVID-19, which supersedes all previous IPC guidance for COVID-19. This guidance includes instructions about different personal protective equipment (PPE) ensembles that are appropriate for different clinical scenarios.

Definition of HCID

In the UK, a high consequence infectious disease (HCID) is defined according to the following criteria:

  • acute infectious disease
  • typically has a high case-fatality rate
  • may not have effective prophylaxis or treatment
  • often difficult to recognise and detect rapidly
  • ability to spread in the community and within healthcare settings
  • requires an enhanced individual, population and system response to ensure it is managed effectively, efficiently and safely

Classification of HCIDs

HCIDs are further divided into contact and airborne groups:

  • contact HCIDs are usually spread by direct contact with an infected patient or infected fluids, tissues and other materials, or by indirect contact with contaminated materials and fomites
  • airborne HCIDs are spread by respiratory droplets or aerosol transmission, in addition to contact routes of transmission

List of high consequence infectious diseases

A list of HCIDs has been agreed by a joint Public Health England (PHE) and NHS England HCID Programme:

Contact HCID Airborne HCID
Argentine haemorrhagic fever (Junin virus) Andes virus infection (hantavirus)
Bolivian haemorrhagic fever (Machupo virus) Avian influenza A H7N9 and H5N1
Crimean Congo haemorrhagic fever (CCHF) Avian influenza A H5N6 and H7N7
Ebola virus disease (EVD) Middle East respiratory syndrome (MERS)
Lassa fever Monkeypox
Lujo virus disease Nipah virus infection
Marburg virus disease (MVD) Pneumonic plague (Yersinia pestis)
Severe fever with thrombocytopaenia syndrome (SFTS) Severe acute respiratory syndrome (SARS)*

*No cases reported since 2004, but SARS remains a notifiable disease under the International Health Regulations (2005), hence its inclusion here

**Human to human transmission has not been described to date for avian influenza A(H5N6). Human to human transmission has been described for avian influenza A(H5N1), although this was not apparent until more than 30 human cases had been reported. Both A(H5N6) and A(H5N1) often cause severe illness and fatalities. Therefore, A(H5N6) has been included in the airborne HCID list despite not meeting all of the HCID criteria.

The list of HCIDs will be kept under review and updated by PHE if new HCIDs emerge that are of relevance to the UK.

HCIDs in the UK

HCIDs, including viral haemorrhagic fevers (VHFs), are rare in the UK. When cases do occur, they tend to be sporadic and are typically associated with recent travel to an area where the infection is known to be endemic or where an outbreak is occurring. None of the HCIDs listed above are endemic in the UK, and the known animal reservoirs are not found in the UK.

As of February 2020, 2019, the UK has experience of managing confirmed cases of Lassa fever, EVDCCHFMERS and monkeypox. The vast majority of these patients acquired their infections overseas, but rare incidents of secondary transmission of MERS and monkeypox have occurred in the UK.

HCID risks by country

For health professionals wishing to determine the HCID risk in any particular country, an A to Z list of countries and their respective HCID risk is available.

See HCID country risks

Monthly summaries of global HCID events

PHE’s epidemic intelligence activities monitor global HCID events. These are published in a monthly summary.

Infection prevention and control in healthcare settings

Specific infection prevention and control (IPC) measures are required for suspected and confirmed HCID cases, in all healthcare settings (specialist and non-specialist).

IPC guidance appropriate for suspected and confirmed cases of Lassa fever, EVDCCHFMVD, Lujo virus disease, Argentinian haemorrhagic fever, Bolivian haemorrhagic fever and SFTS, is available in the ACDP guidance.

IPC guidance for MERS, avian influenza, Nipah virus infection, monkeypox and pneumonic plague, can be found in the relevant PHE guidance listed below.

Read full article here.

Public Health England – March 19, 2020.

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