ASC – On The Line ASC – On The Line Developed by: ASC Command Surgeon’s Office AMSAS-HRS 309-782-2702 / DSN 793-2702.

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Presentation transcript:

ASC – On The Line ASC – On The Line Developed by: ASC Command Surgeon’s Office AMSAS-HRS / DSN

OUTLINE History of Hantavirus Pulmonary Syndrome Characteristics of Known Hantaviruses Case Info and Symptoms Transmission Precautions Who’s at Risk Cleaning Procedures Summary

HISTORY OF Hantavirus Pulmonary Syndrome An outbreak of unexplained illness occurred in May 1993 in the “Four Corners” Previously healthy individuals developed acute respiratory symptoms About half died Rodents were found to be the carrier Specifically the deer mouse “Bumper Crop of Rodents” Heavy snows and rains in 1993 Plentiful supply of food (Pinenuts) Increased population of rodents (10 times) Increased risk of human contact with rodents.

A new hantavirus was identified and called the Muerto Canyon Virus Later changed to Sin Nombre Virus The new disease was called hantavirus pulmonary syndrome (HPS) “New” hantavirus present at least since 1959 Navajo medical traditions associate it with mice HISTORY OF Hantavirus Pulmonary Syndrome

CHARACTERISTICS OF KNOWN HANTAVIRUSES HantaanSeoulPuumala Prospect Hill Sin Nombre Geographic Region AsiaWorldwide Northern Europe U.S. North America Reservoir Field Mouse Domestic Rat Bank Vole Meadow Vole Deer Mouse Pathology Renal NAPulmonary Mortality 5 – 15%1% NA35%

CASE INFO / SYMPTOMS As of MAR 26, 2007, 465 cases have been reported. 35 % resulted in death. SYMPTOMS - Early (universal): First fatigue, fever, & muscle pain (flu-like) - Early (about half): Headache, dizziness, chills - Late (universal): severe shortness of breath, coughing & pulmonary edema- leading to severe respiratory compromise TREATMENT At the present time, there is no specific treatment for the hantavirus infection.

Hantavirus Pulmonary Syndrome Cases by State of Residence– March 26, 2007 Total Cases (N=465 in 31 States) 0 Cases >=10 Cases 5-9 Cases 1-4 Cases

Chronically infected rodent Virus is transmitted to humans through inhalation of aerosolized urine and feces Virus present urine, feces, saliva, and nests TRANSMISSION

CARRIERS DEER MOUSE COTTON RAT RICE RAT WHITE-FOOTED MOUSE

Distribution* of the Deer Mouse and Location of HPS Cases as of September 18, 2002 *Rodent distributions from: Burt WH, Grossenheider RP. A Field Guide to the Mammals. 3rd ed. New York, New York. Houghton Mifflin Company SNV Other virus NY Black Canal Bayou

WHO’S AT RISK? Anyone - old/young/male/female Living almost anywhere in the Americas Similar hantavirus strains are found throughout the world (i.e., Korea, Balkans, Northern Europe) HPS case situations: –planting or harvesting field crops –occupying previously vacant cabins or other dwellings –cleaning barns and other outbuildings –disturbing rodent-infested areas while hiking or camping –inhabiting dwellings with indoor rodent populations –residing in areas of increased rodent population density

GENERAL PRECAUTIONS Air out closed up buildings for at least 30 minutes Eliminate rodents/availability of food sources /nesting sites Wet down infested areas with bleach/disinfectant to kill virus in other words: AIR OUT, SEAL UP, TRAP UP, CLEAN UP

PRECAUTIONS WHILE OUTDOORS Watch for signs of rodents (droppings/nests). Avoid rodent infested areas. Use proper hygiene procedures while in outdoors, specifically before eating or drinking. See your physician if symptoms of HPS develop, especially if you were in contact with rodents. “ensure you state you were around rodents”

CLEANING PROCEDURES Clean equipment/items outside if possible (direct sunlight – destroys the virus). Wear rubber, latex, vinyl, or nitrile gloves during cleaning. DO NOT stir up dust by sweeping, vacuuming, etc. Wet contaminated areas with disinfectant/bleach to deactivate the virus. A 10% hypochlorate solution may be used (1½ cups of household bleach in one gallon of water). Once wetted, remove materials with a paper towel. Clean items, floor, and other surfaces with disinfectant. Spray dead rodents with disinfectant, then double bag with cleaning materials. Bury, burn or dispose of properly. Disinfect gloves before taking them off, wash hands with soap. Rodent Urine and Droppings and Contaminated Surfaces

CLEANING PROCEDURES Wear rubber, latex, vinyl, or nitrile gloves during cleaning. Use insect repellent (containing DEET) on clothing, shoes, and hands to reduce risk of fleabites that might transmit plague. Spray dead rodents with disinfectant or chlorine solution thoroughly. Double bag the dead rodent and cleaning materials. Bury, burn or dispose of properly (contact local health departments). Clean surrounding area as in previous slide. Dead Rodents and Rodent Nests

CLEANING PROCEDURES Air out building for at least 30 minutes. Leave the area during the air-out period. Assists in removing infectious hantavirus aerosols. In substantially dirty or dusty environments, wear additional PPE such as coveralls (disposable if possible) and goggles or safety glasses. Shed and Outbuilding: to include supply containers, bunkers, magazines, warehouses, boxcars, and stored vehicles Facilities or stored vehicles that are abandoned or are closed up for long periods (weeks or months) without ventilation pose the greatest risk.

CLEANING PROCEDURES Heavy Rodent Infestation: piles of feces or numerous nests or dead rodents Cleanup procedures same as previous situations (slides 14-16) Persons involved with cleanup will wear: - coveralls (disposable if possible)- rubber boots or shoe covers - rubber, vinyl, or nitrile gloves- protective goggles - half mask or powered air purifying respirators (PAPR) with N-100 filters - soldiers may wear the M-40 mask Decontaminate PPE and dispose of all infectious waste material to include respirator filters in accordance with local guidance Heavy Rodent Infestation & Confirmed Hantavirus Infection: Applies when occupied person with confirmed hantavirus case and can apply to facilities or structures that are closed up for extended periods

LOCAL GUIDANCE AND ASSISTANCE Contact local installation Preventive Medicine (PM) Services or local and State Health Department –Local threat –Local procedures and precautions If not on an Army installation with medical services, contact local USACHPPM regional command at –Entomologists can provide guidance –Capability to sample rodents for hantavirus prevalence

SUMMARY Risk of becoming ill is very Low, but the fatality rate is High. Hantavirus is prevalent throughout the U.S. and similar strains are located worldwide Precautions must be used to protect yourself Proper cleaning procedures must be followed

Hantavirus Information. Much of the briefing info came from the below CDC web site. Additional information and references can be found at: - The Center for Disease Control and Prevention (CDC) web site: Teaching materials such as PowerPoint slide shows, prevention campaign images, and handout cards are at: Brochures, technical manuals, and videos by mail can be found at the CDC’s Special Pathogens Branch page and learn how you can order prevention materials: -The U.S. Army Center for Health Promotion and Preventive Medicine (USACHPPM), Entomological Sciences Program web site: - The Armed Forces Pest Management Board home site ( ) has Technical Information Memorandum No. 41, “Protection from Rodent-borne Diseases” available for download.

BACKUP SLIDES FOLLOW

Sin Nombre Peromyscus maniculatus Rio Segundo Reithrodontomys mexicanus El Moro Canyon Reithrodontomys megalotis Andes Oligoryzomys longicaudatus Bayou Oryzomys palustris Black Creek Canal Sigmodon hispidus Rio Mamore Oligoryzomys microtis Laguna Negra Calomys laucha Muleshoe Sigmodon hispidus New York Peromyscus leucopus Juquitiba Unknown Host Maciel Necromys benefactus Hu39694 Unknown Host Lechiguanas Oligoryzomys flavescens Pergamino Akodon azarae Orán Oligoryzomys longicaudatus Caño Delgadito Sigmodon alstoni Isla Vista Microtus californicus Bloodland Lake Microtus ochrogaster Prospect Hill Microtus pennsylvanicus New World Hantaviruses Bermejo Oligoryzomys chacoensis Calabazo Zygodontomys brevicauda Choclo Oligoryzomys fulvescens