UNCONTROLLED WHEN PRINTED

This document should be considered a live document and will be reviewed and updated regularly in response to:

  • New legislation or statutory directions; OR
  • Changes in advice based on emerging evidence or national guidelines; OR
  • Learnings from outbreak management locally, in other jurisdictions and internationally

Key Points:

Be alert for monkeypox infection. Monkeypox cases have increased significantly internationally and have been reported interstate with a confirmed case first reported in WA on August 4 with contact tracing being conducted.

Infectious Agent

Monkeypox virus is a poxvirus (Family Poxviridae, genus Orthopoxvirus; other members include variola and vaccinia viruses)

Mode of Transmission

Contact:

Close contact with an infected person or animal, or with material contaminated with the virus, such as bedding. Human-to-human transmission can occur through:

  • close contact with lesions on the skin, including during sexual contact
  • body fluids, including respiratory particles, containing infectious material
  • fomites, such as contaminated linen, clothing, or towels

Droplet/Airborne:

  • Transmission via respiratory particles usually requires prolonged face-to-face contact, which puts health workers, household members and other close contacts of active cases at greater risk
Incubation period

5 – 21 days (but usually 6 – 13 days). Rash appears 1 – 5 days after initial symptoms

Infectious period

From the onset of the prodrome until the vesicles have scabbed over and the scabs have fallen off

Signs and SymptomsSigns and symptoms include:
  • prodromal period (initial symptoms) may include fever, malaise, headache, lymphadenopathy, and sometimes sore throat and cough
  • later stage - A distinctive rash (lesions) usually begins within 1-3 days of onset of fever.  The rash typically begins in the oropharynx and then may appear on the:
    • face (95% of cases)
    • palms of the hands and soles of the feet (75% of cases)
    • inside of the mouth (70% of cases)
    • genitalia (30% of cases)
    • eyes (20% of cases)
The number of lesions vary from a few to several thousand and progress through four stages: macular, (lesions with a flat base) papular, (lesions slightly raised and firm), vesicular (filled with clear fluid) to pustular (filled with yellowish fluid), before scabbing over and resolving (usually takes 2-3 weeks). Unlike chickenpox where lesions in different stages can be present at a given time, all the lesions develop uniformly through the stages over 4-5 days. Lesions can be localised to a specific area of the body.

Monkeypox

Suspected cases are those with:

  • A clinically compatible illness with rash on any part of the body (with or without lymphadenopathy, fever, headache, myalgia, arthralgia or back pain) AND
  • Epidemiological evidence in the 5-21 days before symptom onset:
    • an epidemiological link to a confirmed or probable case, OR
    • overseas travel, OR
    • sexual contact and/or other physical intimate contact with a gay, bisexual or other man who has sex with men*

* Although the virus is not considered to be a sexually transmitted infection, transmission can occur through intimate physical contact during sex. In this case, it is likely that infectious skin rashes, blisters or sores are the mode of transmission. In the current outbreak, men who have sex with men have been disproportionately impacted while noting that Monkeypox can effect anyone and as such vigilance is required with all patient cohorts

Precautions required

Contact and Droplet/Airborne:

PPE

  • Gloves
  • P2/N95 respirator (Fit tested and checked)
  • Eye protection
  • Gown/coveralls
  • Patient to wear a surgical mask if able to tolerate

Vehicle airflow

Ensure vehicle airflow set per WIAMB22 Ambulance Airflow (Login required)

Cleaning required

See Vehicle Cleaning and Spills Management - after transporting a patient requiring transmission-based precautions (contact, droplet/airborne)

Waste management

Heavily soiled items should be disposed of as clinical waste

Linen management

Items should not be shaken or handled in a manner that may disperse any infectious particles into the environment. All clothing and linen should be bagged at the location of use and placed within an impermeable bag. Seek guidance from thehealthcare facility where the linen is being disposed

Shared transport

Patients who are symptomatic with suspected or confirmed Monkeypox must not share transport with other patients

Further resources

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