Herpes labialis or "herpes orolabial" is a lip infection by herpes simplex virus.
Infected lip causes small blisters or sores on or around the mouth commonly known as coldsores or fever blisters.
The wound usually heals in 2-3 weeks, but herpes virus remains dormant in the facial nerve, after orofacial infection, periodically reactivating (in symptomatic people) to create a wound in the same area of the mouth or face at the original site of infection. 64% of adults in the United States are carriers of the virus that causes cold sores, and more than 50 million adults in the United States have symptoms of this disease every year. Pain sufferers have high levels of pain and frequency of which varies from about 12 or more in a year.
Most people have 1-3 attacks per year. The frequency and severity of outbreaks usually decreases over time. The virus is transmitted from cold sores and also when there are no symptoms, because it can make copies of itself on the skin without blisters.
This phenomenon is called "asymptomatic shedding". 80% -90% of adults under age 50 with HSV-1 pass to someone close to him.
Viruses Microbes
Viruses can spread and grow very fast, but their live also just short time. But they can grow a double in few minutes, and die all when the condition is not suitable with them.
Wednesday, January 4, 2012
Wednesday, December 21, 2011
Viruses Structure
Virus outer shell have function to protect fragile nucleic acid genome from physical damage, chemical damage and enzymatic damage. The protein subunits in a virus capsid are multiply redundant, it mean that if the damage to one or more subunits may render that particular subunit non-functional, but does not destroy the infectivity of the whole particle.
The outer of viruses surface is responsible for recognition of the host cell. It takes the form of binding of a specific virus attachment protein to a cellular receptor molecule. While capsid has a role to play in initiating infection by delivering the genome from its protective shell which can interact with the host cell.
After some experiment to purified of tobacoo mosaic virus (TMV) RNA and coat protein were incubated together, virus particle formed. Virus particles could form spontaneously from purified subunits without any extraneous information indicated that the particle was in the free energy minimum state.
Tobacco mosaic virus is representative of one of two major structural classes seen in viruses of all types with helical symmetry. The simple way to arrange multiple, identical protein subunits is to use rotational symmetry and to arrange the irregularly shaped protein around the circumference of a circle to form a disc.
The outer of viruses surface is responsible for recognition of the host cell. It takes the form of binding of a specific virus attachment protein to a cellular receptor molecule. While capsid has a role to play in initiating infection by delivering the genome from its protective shell which can interact with the host cell.
After some experiment to purified of tobacoo mosaic virus (TMV) RNA and coat protein were incubated together, virus particle formed. Virus particles could form spontaneously from purified subunits without any extraneous information indicated that the particle was in the free energy minimum state.
Tobacco mosaic virus is representative of one of two major structural classes seen in viruses of all types with helical symmetry. The simple way to arrange multiple, identical protein subunits is to use rotational symmetry and to arrange the irregularly shaped protein around the circumference of a circle to form a disc.
Respiratory Syncytial Virus (RSV)
Respiratory Syncytial Virus (RSV) discovered in 1956, known able of causing a broad spectrum of illnesses. Fever, nasal congestion, and cough are their most common complaints. RSV can produce severe pulmonary disease, including bronchitis and pneumonia an infection of terminal airways.
RSV is highly contagious virus infection that most commonly causes illness during winter season. The mild symptoms of children who develop RSV infection such as fever, nasal, congestion and nasal discharge. Supportive care is the mainstay of therapy. For high risk patients, palivizumab (Synagis) preventive therapy is available.
RSV infection is seasonal, in temperate climate, RSV infection usually occur during the late fall, winter or early spring months. Many infants are exposed to RSV by their first birthday, many have few or mild symptoms. RSV is the most common cause of bronchitis and pneumonia among infants and children under 1 year old.
After childhood, RSV causes repeated infections throughout life. These infections are usually associated with cold like symptoms. Sever lower respiratory tract diseases may occur at any age, especially among the elderly or among those with compromised cardiac, pulmonary, or immune systems.
RSV is highly contagious virus infection that most commonly causes illness during winter season. The mild symptoms of children who develop RSV infection such as fever, nasal, congestion and nasal discharge. Supportive care is the mainstay of therapy. For high risk patients, palivizumab (Synagis) preventive therapy is available.
RSV infection is seasonal, in temperate climate, RSV infection usually occur during the late fall, winter or early spring months. Many infants are exposed to RSV by their first birthday, many have few or mild symptoms. RSV is the most common cause of bronchitis and pneumonia among infants and children under 1 year old.
After childhood, RSV causes repeated infections throughout life. These infections are usually associated with cold like symptoms. Sever lower respiratory tract diseases may occur at any age, especially among the elderly or among those with compromised cardiac, pulmonary, or immune systems.
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