Archive for the ‘Disinfect’ Category

Disinfect–Don’t Infect

Wednesday, September 23rd, 2009

Disinfect – Don’t Infect

Controlling viral populations on household surfaces is an effective way to cut down on the spread of seasonal and H1N1 flu. Although flu viruses require live host cells to multiply and spread, they can live on inanimate surfaces for hours or even days. Good hygiene requires more than just cleaning. Proper disinfection provides an additional safeguard for areas where people come into contact with contaminated surfaces.

Disinfect frequently used surfaces with a diluted chlorine bleach solution or disinfectant wipes.

Some common surface areas are “hot spots” for germs, including doorknobs, counters, table tops, dials, handles and switches. In fact, it can take up to 3 days for viruses on surface areas to die. To use chlorine bleach for general surface area disinfection, use a fresh mixture of ¼ cup of household bleach with one gallon of cool water (if you need a small amount, use one tablespoon of bleach in a quart of water). Apply to surfaces. Leave wet for 10 minutes, then rinse.

Disinfectant wipes also can be used to eliminate viruses on everyday items, such as telephones, cell phones, computer keys, computer mouse, arm rests and children’s toys.

Clean dishes, cups and utensils in the dishwasher.

If washing by hand, use very hot water and use a diluted bleach solution in the rinse water to disinfect. The right mix is 1/4 cup of household laundry bleach in one gallon of water.

Use chlorine bleach on white bedding, towels and other laundry as appropriate.

According to a 2004 study by the National Institute of Nursing Research, households that use hot water and bleach in the laundry experience almost 25% less infections than households that do not bleach

Chlorine Bleach: Helping to Manage the Flu Risk

Wednesday, September 23rd, 2009
A Flu Risk

Management Plan

Obtain the flu vaccine, preferably in October or November.
Cover mouth and nose when coughing or sneezing.
Wash hands often for 15-20 seconds at a time (long enough to sing “Happy Birthday”).
Disinfect surfaces with diluted chlorine bleach solution (1/4 cup per gallon water).
Remind children to practice healthy habits.

Every fall, millions of Americans rush to be vaccinated against the influenza virus, or “flu,” in the hope of avoiding the worst of the seasonal symptoms of fever, headache, fatigue, cough, sore throat, runny nose, congestion and muscle aches. According to the U.S. Centers for Disease Control and Prevention (CDC), getting an annual flu vaccine is the best way to prevent this disease.

A sound risk management plan for avoiding flu infection maximizes all known preventive measures, including “flu shots” for everyone six months old and older, frequent hand washing and smart use of a common household product–chlorine bleach.

How Viruses Operate and Propagate

A virus consists of a small collection of genetic material surrounded by a protective protein shell. As very simple microbes, viruses cannot reproduce on their own, but only by “hijacking” various living host cells, including bacteria, plant, animal and human.

Viruses inject their genetic material into the DNA of host cells and manipulate them to manufacture millions of new virus particles. And to ensure the efficient spread of the newly produced virus particles, the coughing and sneezing of human flu sufferers send droplets of virus-laden mucous streaming into the air and onto human skin, including mouths or noses of people nearby, and other surfaces. Dr. Dennis Clements, a professor of pediatrics and infectious diseases at Duke University, estimates that a single sneeze can send flu-infested water droplets as far as three feeti.

Equipped with a mode of transportation to new, fertile host cells, the virus thrives, even if, statistically speaking, most organisms fight the infection successfully. Most important to the virus’ survival, it is on the move, ever seeking and infecting new hosts.

Outsmarting the Flu Virus With Chlorine Bleach

Although viruses require live host cells to multiply and spread, they can live on inanimate surfaces for up to two hours or more, giving them a convenient window of opportunity to be picked up by unsuspecting organisms, namely, us. Likely points of infection are commonly touched surfaces: doorknobs, desks, counters, dials and handles. Managing the viral populations on these surfaces is an effective way to cut down on the spread of flu. Chlorine bleach is a logical germ-busting, readily available product to turn to for this task. It works by penetrating the protective shells of viruses.

An EPA-registered chlorine bleach solution or a dilute solution of regular laundry bleach (1/4 cup of bleach in a gallon of cool water) is an effective and inexpensive all-purpose disinfectant, used commonly in homes and healthcare facilities. Some health clubs keep spray bottles of chlorine bleach solution on hand for members to use to disinfect exercise equipment. The active ingredient in chlorine bleach, sodium hypochlorite, is one of the chlorine disinfectants routinely added to municipal drinking water to control waterborne disease. Since the introduction of water chlorination to the U.S. in 1908, death rates due to typhoid fever, cholera and hepatitis A have declined dramatically. In addition to water disinfection, chlorine bleach solutions are approved by the Environmental Protection Agency (EPA) and the Department of Agriculture (USDA) for use in safe food production, including food preparation and service in healthcare facility kitchens and cafeterias. Chlorine bleach is used routinely to kill common food pathogens such as Campylobacter, Salmonella and E. coli.

The Chlorine Bleach Surface Disinfectant formula

¼ cup chlorine bleach 1 gallon cool water

Mix and apply to surfaces. Leave wet for 10 minutes. Rinse.

A recent study by the National Institute of Nursing Research showed that hot water and bleach are more effective in reducing viral infections, such as flu, than antibacterial products. This is not unexpected because antibacterial products work only on bacteria, whereas bleach destroys both viruses and bacteria. According to the study’s author, Dr. Elaine Larson, PhD, RN, Associate Dean for Research at Columbia University’s School of Nursing, households reporting bleach use for laundry at the beginning of the study experienced approximately one-fourth the rate of infection of households that did notii.

Children And Flu: Special Considerations

According to the U.S. Department of Education, approximately one-fifth of the U.S. population attends or works in schools. Additionally, large numbers of American families rely on day care facilities for full-time or after-school child care.

Compared to adults, children have fewer antibodies for fighting off illness, which allows viruses to multiply more quickly in children’s bodies. With more viruses in their bodies, youngsters can spread viruses more easily. Children under age two often suffer gastrointestinal problems when they are infected with the flu, and their stool contains the virus. Add to this the less-than-perfect hygiene practiced by many young children, and the risk of infection from contact with youngsters rises.

The CDC has issued advice for preventing the spread of flu in childcare settings. In addition to vaccinating all children between six and 23 months of age, recommendations include teaching proper hand washing and keeping childcare environments clean. Frequently touched surfaces, such as toys and other commonly shared items, should be disinfected daily with either an EPA-registered hospital disinfectant or EPA-registered chlorine bleach solution. According to the recommendations, if an EPA-registered chlorine bleach is not available, generic chlorine bleach may be used by mixing ¼ cup chlorine bleach with 1 gallon of cool water.

Getting Through Flu Season With the Help of An Old Friend

From farm animals to humans

Influenza virus ultimately originates in farm animals from which it is transferred to humans. For centuries, people noticed that flu outbreaks coincide with epidemics in pigs, ducks and horses. Human influenza probably dates back to 2000-5000 B.C.-the time of domestication of these animals. The virus owes its longevity to an ability to incorporate small changes, or mutations, as it shuttles between humans and domesticated animals.iii

Understanding how viruses use us to sustain their existence in the great web of life is an aid to developing the best flu risk management plan possible. Getting a flu shot, limiting contact with the infected, washing hands frequently and thoroughly, and mixing up an effective germ-busting solution of water and familiar household laundry bleach will go a long way to protecting us from nature’s seasonal flu scourge.

Flu Statistics

  • The time from when a person is exposed to flu virus to when symptoms appear is about one to four days, with an average of about two days.
  • The US normally vaccinates a larger proportion of its population than any other country except Canada.
  • Two-thirds of the US supply of flu vaccine usually goes to adults between 18 and 65. Yet 90 percent of deaths from flu occur in those over 65 years of age.
  • On average, approximately five to twenty percent of US residents get the flu, and more than 200,000 persons are hospitalized for flu-related complications each year.
  • The yearly death toll in the U.S. from flu varies from 17,000 to 51,000.

i Weigl, A., (2004, Oct. 14). Staying safe: Precautions can help cut the risk, On-line. Available:

ii Wart, P.J. (2004, Oct. 12). The virus fighting duo: Hot water and bleach, HEALTH Plus Health and Wellness, Vanderbilt University. On-line. Available:

iii Karlen, A. (1995). Man and Microbes: Disease and Plagues in History and Modern Times. New York: Simon & Schuster.

USA Today – Fight swine flu with good hygiene

Friday, September 18th, 2009

A recent USA Today article on H1N1, or swine flu, highlights once again that the best way to prevent such diseases is through the practice of good, basic hygiene.

That is especially true in the case of schools where large numbers of children are in close contact. When exposed, those children become a reservoir for spreading the infection at home and in other settings. When I read that many schools now wipe down desks regularly, I wondered why they hadn’t been doing this already. This would prevent not only the flu, but also the spread of other viruses and germs.

As a public health professional, I know that cleaning and disinfection are always a part of a smart prevention strategy. In schools, disinfection is critically important for areas where students come into contact with contaminated surfaces, including bathroom fixtures, doorknobs, handrails, athletic equipment and desktops. Diseases can be readily transmitted via all these surfaces. The use of an effective cleaning agent followed by a proven disinfectant such as chlorine bleach after cleaning can effectively help prevent the spread of disease.

Add good hand washing with the appropriate use of hand sanitizers, and you have the recipe for healthy students and a healthy school.