— Biological Safety at USAMRIID —
Established in 1969, USAMRIID has decades of experience operating containment laboratories and has
provided extensive training and consultation to other agencies setting up their own facilities.
We consider safety—of our employees, our neighbors, and the surrounding community—our number one priority.
There are four levels of biological containment, ranging from Biosafety Level (BSL)-1, the lowest, to BSL-4,
the highest. BSL-1 would be comparable to an open bench laboratory found in a school classroom—no
special precautions would be needed. At BSL-2, USAMRIID employees wear laboratory coats and observe
other basic precautions. For BSL-3 work, we require our personnel to change into scrub suits before
entering the laboratory and take a complete shower before exiting. Other personal protective equipment
may be required as well, depending on the tasks to be performed. BSL-4 is the highest level of containment,
and employees wear positive-pressure suits commonly called "space suits" and breathe filtered air as they work.
Complete descriptions of the biosafety levels can be found in the Biosafety in Microbiological and Biomedical
Laboratories (BMBL) handbook (5th Edition) at the following link:
http://www.cdc.gov/biosafety/publications/bmbl5/index.htm
In addition, a combination of rigorous training, meticulous procedures, tight security, carefully designed
structures, and elaborate and redundant operating systems is in place to protect our laboratory workers.
These measures also ensure the safety of those outside the suites. Investigators working in USAMRIID
laboratories are highly trained to follow established safety procedures.
Heat, pressure, and chemical systems housed in the laboratory suites process and decontaminate all liquid
and solid wastes completely, and air passes through high-efficiency particulate air filters, making all
the liquid and air effluents safe before they leave the facility. Multiple redundancies in equipment
and systems help to ensure that if an unexpected failure were to occur, a backup would be in place to
maintain safety.
Investigators in the laboratories study tiny amounts of infectious agents and the diseases they cause in
order to develop vaccines, treatments and diagnostic tools. USAMRIID's research involving infectious
agents is reviewed and approved by the Institutional Biosafety Committee, the Animal Care and Use Committee,
the Portfolio Review Committee, and other internal and external reviewers as applicable. No studies
can take place without careful examination of all protocols to assess risks.
The laboratories at USAMRIID are inspected and overseen by the Department of the Army, the Centers for
Disease Control and Prevention, and many other agencies to ensure their safe and secure operation.
— Safety Report Information —
In the interest of transparency, USAMRIID has compiled data from 2010 and 2011 safety incident reports, which
are filed whenever a laboratory mishap occurs. USAMRIID will update this information annually. Data
from 2012 will be posted during the first quarter of 2013.
In order to properly assess safety performance over time, USAMRIID compared the number of incidents to the number
of times employees entered BSL-3 and BSL-4 laboratories in a given year. It is important to note that in
every incident in 2010 and 2011, no symptoms were reported and there were no signs of illness.
In 2010, USAMRIID had 40,631 entries into BSL-3 laboratories. During that time, there were 34 safety incidents
within those laboratories; 15 were Potential Biological Exposures (PBE). A PBE means that some risk of exposure
to infectious agents and/or toxins may have occurred, resulting in Occupational Health staff placing the personnel
involved on precautionary medical surveillance. In every case, no illness or disease occurred. The 2010
incident rate for BSL-3 laboratories was 0.084 percent.
Looking at BSL-4 laboratories, USAMRIID had 11,011 entries during 2010, with a total of 6 incidents including 3
Potential Biological Exposures (PBE). A PBE means that some risk of exposure to infectious agents and/or
toxins may have occurred, resulting in Occupational Health staff placing the personnel involved on precautionary
medical surveillance. In every case, no illness or disease occurred. The 2010 incident rate for BSL-4
laboratories was 0.054 percent.
For 2011, the data are as follows:
Entries into BSL-3 laboratories: 39,429
Total incidents: 32
Potential biological exposures: 9
Illness/disease: 0
Rate of incidents per entry: 0.081 %
Entries into BSL-4 laboratories: 11,489
Total incidents: 30
Potential biological exposures: 1
Illness/disease: 0
Rate of incidents per entry: 0.261 %
To view a bar graph of the incidents/total lab entries, click here.
— Data Analysis —
USAMRIID documents the type of incidents that occur in the laboratories to track trends and make procedural
changes where necessary.
As an example, in 2011, USAMRIID changed internal reporting requirements to better assess performance of
personal protective equipment. In BSL-4 laboratories, workers wear positive-pressure suits with
heavy gloves attached, and additional gloves underneath. The outer suit gloves can experience
small tears and pin holes, which do not pose a risk of exposure as long as the inner glove remains
intact. However, to better assess each incident, in 2011 USAMRIID began tracking this information.
As a result of this increased reporting requirement, the graph shows an increased number of BSL-4 incidents
in 2011. Based on the findings, USAMRIID identified poorly performing glove types and began standardizing
the types of gloves used across laboratories.
To view a chart that breaks down the types of incidents across BSL-3 and BSL-4 laboratories at USAMRIID in
2010 and 2011, click here.
|