scabies
SCABIES
Scabies is a contagious disease caused by the mite Sarcoptes scabiei var hominis.
The affected individual usually complains of having a highly pruritic rash that occurs at night.
It occurs more often in children <15 years of age, sexually active young adults, the immunocompromised and in persons living in crowded living conditions (eg nursing homes, military barracks).
Transmission is typically by direct skin contact with an infected person and in adults, sexual transmission is common.

Introduction

  • Diagnosis is made based on clinical presentation & can be confirmed by microscopic identification of mites, eggs or mite feces
  • Scabies should be suspected in a patient who presents w/ a highly pruritic rash w/ nocturnal predominance
    • Scabies is highly suggested if there is also a history of contact w/ an infected person or if there is a history of contact w/ family member or sexual partner who has pruritic lesions w/ nocturnal predominance
  • Scabies is caused by the mite: Sarcoptes scabiei var hominis

Signs and Symptoms

Clinical Presentation

  • Occurs more often in children <15 yr, sexually active young adults, the immunocompromised & in persons living in crowded living conditions (eg nursing homes, military barracks)
  • Transmission is typically by direct skin contact w/ an infected person & in adults, sexual transmission is common
    • Though there is limited documentation, transmission by fomites may be possible (esp in cases of crusted scabies where a large amt of parasites are involved)
    • The mites can live for up to 30 days on a host & remain alive for 3 days on furniture, bedding etc
Signs & Symptoms
  • Primary symptom is generalized pruritus, which is usually worse at night
    • Pruritus is caused by a hypersensitivity reaction to the mite & its products (saliva, eggs & feces) once the host becomes sensitized
    • Hypersensitivity occurs 4-6 wk after infestation but occurs in 1-4 days w/ re-infestation because the host has been previously sensitized
Digital Edition
Asia's trusted medical magazine for healthcare professionals. Get your MIMS Infectious Diseases - Malaysia digital copy today!
Sign In To Download
Editor's Recommendations
Most Read Articles
Jairia Dela Cruz, 30 Aug 2019
Infection with hepatitis B virus (HBV) does not appear to independently affect pregnancy outcomes, although it contributes to prolonged infertility, higher odds of secondary infertility, ovulatory disorders and reduced implantation rate, a study has found.
Dr. Joseph Delano Fule Robles, 23 Jan 2019

Scientists from the Department of Microbiology, University of Hong Kong (HKU) recently discovered a compound with broad antiviral activity against viruses causing Middle East Respiratory Syndrome (MERS), avian flu (H7N9), severe acute respiratory syndrome (SARS) and Zika fever.

Pank Jit Sin, 27 Jun 2019

How does it feel to be told one has contracted HIV? How equipped are doctors when breaking the news to a patient that he or she has been diagnosed with HIV? Are we able to provide people living with HIV (PLHIV) the counselling and skills required to take them through this difficult period of life? MIMS Doctor speaks to Dr Julian Hong, a general physician practicing in Singapore, about the challenges faced by both patients and doctors when faced with the difficult topic of HIV.