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Robert Gay, ACVCSD
Bed Bugs and Their Bites
“Good Night, Sleep Tight, Don’t let the bed bugs bite!”
Pierce through the skin to obtain blood meals
Feed from one host to another host without discrimination
Bed Bugs
Are able to travel far and disperse quickly
Live in close proximity to humans
Airline Travel
Theoretically, bed bugs appear to be great candidates for disease vectors.
However, to date, there has been no conclusive evidence that shows bed bugs biologically or mechanically transmit any diseases.
Bacillus anthracis (anthrax) Borellia recurrentis (relapsing
fever) Brucella melitensis (brucellosis) Coxiella burnetii (Q fever) Fracisella tularensis (tularemia) Leptospira spp (leptospirosis) Mycobacterium tuberculosis
(tuberculosis) Rickettsia typhi Salmonella typhi (salmonella) Streptococcus pneumonia
(pneumonia) Staphylococcus aureus
Yersinia pestis (plague) Wuchereria Parasites (filariasis) Leismania tropica Plasmodium spp Trypanosoma cruzi Hepatitis B, C, E HIV Influenza Polio Rabies Variola (smallpox) Yellow fever
Bed bugs have been accused of transmitting nearly 45 different pathogens.
. A few familiar ones:
Hepatitis B
HIV
Has never been found in wild bed bugs.In an experiment, HIV was detected up
to 8 days in bed bugs fed with the virus, but was never found to replicate.
Has not been found in bed bug feces, Little persistence of the pathogen.
HIV transmission
Has been detected in wild bed bugs.In an experiment, HBV was detected up
to 2 months after an infectious meal or after direct injection, but no viral replication.
Found bed bugs were able to maintain the pathogen between molting, but did not find the pathogen in the salivary glands.
Hepatitis B transmission
Bed bugs do not exhibit the three developmental requirement of biological transmission:
a) multiplicationb) developmental changesc) combination of the two
Why are they not good disease vectors?
Large intervals of time between feedings. Allows for digestion, molting, and oviposition which is a disadvantage to the pathogens
Traumatic insemination may play a role in building immune responses in females
Live in relatively “sterile environment” to be mechanical vectors
Skin reaction to bitesAllergic reactionsMental & emotional distressEconomic impact
Public Health Importance
Skin reaction to bites
Public Health Importance
Skin Reactions to Bed Bug Bites
1. Victims may be asymptomatic.
2. For most people, bites itch intensely.
3. Scratching bites can cause tissue damage & scars
4. Scratching can also introduce secondary infections (e.g., MRSA, or other microbes)
Initial bite reaction
Image above by Dr. Mark Feldlaufer
Biting Insects - Indoors
Flea Bites
Tropical Rat Mite Bites
Bed bug Bites
Methicillin-resistant Staphylococcus aureus (MRSA)
Skin reaction to bitesAllergic reactions
Public Health Importance
Depending on host immune response and sensitivity, allergic reactions can range from people who are asymptomatic, asthmatic, or anaphylactic.
Bullous eruptions have also been reported in association with multiple bed bug bites.
Allergic Reaction
Bed Bugs (C. lectularius) can cause Asthma (& make it worse)
_______________________
Abou Gamra, E., F. el Shayed, T. Morsy, H. Hussein, and E. Shehata . 1991. The relation between Cimex lectularius antigen and bronchial asthma in Egypt. J. Egyptian Soc. Parasitol. 21: 735-746 (Dec.).
Skin reaction to bitesAllergic reactionsMental & emotional distressEconomic impact
Public Health Importance
Entomophobia “I’m scared of bed bugs”
Bringing bed bugs into your home, car, or the office.How to tell the family, neighbors, & friends.
FEAR FACTOR!
Mental & Emotional Distress
Unable to sleep!
Sleep deprivation
Although evidence for disease transmission
by bed bugs is inconclusive, issues of:vector competence, reactions to insect bites, embarrassment, and mental anguish
have been the basis for lawsuits against
landlords and lodging corporations.
Economic impact
“Although bed bugs are not known to transmit disease, they are a pest of significant public health importance.”
-EPA & CDC Joint Statement
Centers for Disease Control and Prevention and U.S. Environmental Protection Agency. Joint statement on bed bug control in the United States from the U.S. Centers for Disease Control and Prevention (CDC) and the U.S. Environmental Protection Agency (EPA). Atlanta: U.S. Department of Health and Human Services; 2010.
In conclusion