Hepatitis B Virus Characteristics: Hepatitis B Virus (HBV) is a double-stranded DNA virus in the Hepadnaviridae family. The infectious particle is 42nm in diameter, with a genome 3200 nucleotides long. It has an outer envelope and an icosahedral nucleocapsid, which contains viral DNA polymerase and has a diameter of 27nm. The envelope contains the HBV surface antigen (HBsAg); this is the molecule to which anti-HBV antibodies are directed. The non-infectious hepatitis B particles are composed
HEPATITIS B VIRUS Hepatitis B Virus (HBV) is a virus that attacks the liver. The virus is transmitted through blood and bodily fluids. This can occur through direct blood-to-blood contact, unprotected sex, use of contaminated needles, and from an effected mother to her newborn during the delivery process. The majority of people do not have noticeable symptoms when they are first infected with the HBV. People who do not know they are infected with the HBV, their body can respond in different ways
Hepatitis B virus (HBV) is a severe and common virus that has infected ‘more than two billion people alive today at some point in their life.’1 It is a hepadanavirus that interferes with the liver functions as it replicates in the hepatocytes (liver cells) and induces a immune response that is responsible for the inflammation of liver.2 Viruses are not motile, which means that HBV is also sessile and does not form spores. The spherical virion, is called a Dane Particle3 that is 42nm in diameter binds
or hepatitis B virus is likely. Many people do not know that there has never been an actual reported case of contracting AIDS while getting a tattoo. This is because the amount of blood needed to contract the AIDS virus is about two drops, which is incomparable to the amount of blood on a non-sterilized needle. So, basically the odds of contracting AIDS is one in every two hundred cases of accidental sticking with a non-sterilized needle. One is more susceptible to the hepatitis B virus, because the
Introduction The influenza virus is an RNA virus has an envelope that included members of the family Orthomyxoviridae. Its genome is a single negative strand segmented RNA. This virus consists of three types: A, B, and C. Influenza types A and B has eight segments of RNA, but the influenza virus type C only has 7 segments (Cheung and Poon, 2007). Influenza A virus is a virus that spread and infect many species of animals such as pigs, horses, cats, tigers, leopards, marine mammals and fowl and including
clear understanding of the virus which has worldwide effects. Also, a clear understanding of research and surveillance data conducted and collected by governmental agency, will be understood. One will grasp preventive or protective methods from what can end up becoming a deadly virus. One will comprehend governmental findings and investigations. The signs and symptoms will become more easily recognizable. Knowledge will be gained of treatments used to combat the virus to ensure little to no fatalities
of living organisms” (Biology). Bacteriophage are more specific in a sense that they are “a virus that infects and replicates within a bacterium” not just any living organisms cells (Biology). These viruses can replicate in 2 different cycles: lytic cycle or the lysogenic cycle. If a virus takes enters the lytic cycle it will cause infection and destruction of the host cell. This is done when the virus first penetrates the cell membrane of the host cell.
Rotavirus is the most common cause of diarrhea in young infants. This virus was discovered in 1973. It is a non enveloped, double stranded RNA virus in Class III of the Baltimore Classification system. It is part of the virus family Reoviridae. There are five different species of this virus known as A, B, C, D, and E. Rotavirus A is the most common species of the virus causing more than 90% of infections in humans. It causes severe gastroenteritis and is a major cause of disease and death in children
ASSIGNMENT # 1: GENERAL PRINCIPLES OF MICROBIOLOGY 1. Describe the components of the bacterial cell envelope and the primary function of each. The innermost layer of the bacteria cell envelope is the cell membrane. It is a typical phospholipid bilayer, as is found in animal cells. The primary function of the cell membrane is energy production and active transport. The next layer is the cell wall. It is made of N-acetyl glucosamine and N-acetyl muramic acid. Amino acids keep the cell wall together
Latency is defined as the silent persistence of the virus in the body, not detectable by conventional virological procedures (1). Infectious virus is only recovered from latently infected organs by prolonged culture of organ cells or co-culture of these cells with susceptible cells (5). Therefore, no infectious virus is reisolated in cell cultures inoculated with a triturated organ latently infected. Latency is the property shared by some viruses which allows them to persist indefinitely in their
Nguyen Le Tam Nhan 10672137 Midterm Assignment The role of nuclear import for influenza A virus infection The flu, is characterized as an infection of the respiratory tract caused by influenza viruses. Influenza infection is commonly ranked as one of the most dangerous diseases on Earth because it affects all age groups and can re-occur in any individual. Influenza A, B and C viruses belong to the orthomyxovirus, which is the family of enveloped viruses with segmented, single-stranded, negative-sense
500 years. There are three main types of the virus; types A, B and C. Once the minuscule particles of the virus are inhaled, they locate their target cells using the proteins that surround the nucleus. These contain genetic material, which then trigger the target cells to produce more virus particles. Once these cells spread through the body and into the immune system, an infected person will begin to feel the physical symptoms of the flu. As the virus spreads through the body, it becomes present
Polio Virus Introduction The polio virus which causes poliomyelitis in humans is an enterovirus which belongs to the picornavirus (small, RNA) family. Polio virus is rapid, acid-resistant, stable, highly tissue specific and consists of a single-stranded, positive RNA. Polio virus is able to reside in the throat or intestinal tract of humans. Poliomyelitis is a highly contagious infectious disease which has three strains, poliovirus 1 (PV1), PV2 and PV3. Polio virus, although rare in developed
Advanced technology affords many benefits to human beings, but it also provides instruments of mass destruction. For example, advanced biological technology may provide cures for illnesses but it also provides instruments of biological terrorism. When war involves these microscopic, deadly, biological agents, it takes on a new and frightening dimension. Human beings harnessing the power of bacteria to kill large quantities of people sounds like science fiction. Unfortunately, we now hear about use
antibody. A. Flow cytometry profiles for immunoreactivity of single-clone HA1-M mutants displayed on the surface of yeast. Single point mutations that abolish yeast surface binding of anti-H5 2AscFvFc were analyzed and mapped to distinct regions of HA1. B. Schematic representation of the epitopes recognized by anti-H5 2AFc to HA1 on the yeast surface. Amino acid positions are designated in H5 numbering. A linear epitopes (aa 206-211) recognized by 2AFc is colored in red. The regions encompassing the receptor-binding
X-linked Agammaglobulinemia, or XLA for short, was the first immunodeficiency disease ever to be discovered. Ogden C. Bruton, the man who discovered it, was studying an eight-year-old boy in 1952 who had very confusing symptoms. He studied the boy for almost four years and was still confused by the randomness of his symptoms. The boy was getting many infections in these four years and Bruton could not figure out why until he decided to investigate the boy’s blood. He found that the boy was not producing
1. 8. Dengue Virus The causative agent of the dengue disease is the dengue virus (DENV), a group of four flaviviruses that are closely related but antigenically distinct. They are hypothesised to have evolved independently from ancestral sylvatic viruses between 100-1,500 years ago (Wang et al., 2000). The four groups are known as serotypes and denoted as dengue virus type 1 (DENV-1), dengue virus type 2 (DENV-2), dengue virus type 3 (DENV-3) and dengue virus type 4 (DENV-4). 1. 8. 1. Taxonomy There
called the kissing disease. The virus that causes mono is called Epstein-Barr virus (EBV), which is one of the multiple human herpes viruses that are carried asymptomatically by most people. Primary infection is particularly usual in childhood and establishes a lifelong carrier state where the virus remains latent. The EBV replicates frequently in the oropharyngeal epithelial cells and circulating B-lymphocytes, since they are the principal targets of the virus. Mononucleosis is mainly a disease
are introduced physically or chemically in a way that allows the cell membrane to be temporarily permeable to a foreign DNA. In the second method used for gene therapy, transduction, there is a beneficial gene added into the genetic material of the virus, which then is allowed to infect the target cell which is the indirect transfer method for gene therapy. There have been four somewhat recent successful gene therapy treatments. The four deal with correcting hemophilia, bone marrow transplants, skin
PANLEUKOPENIA VIRUS Virus Classification: Order: Mononegavirales Family: Parvoviridae Subfamily: Parvovirinae Genus: Parvovirus Species: Feline panleukopenia virus Also called feline infectious eneritis, feline “distemper”, and feline ataxia or incoordination. Examples of other viruses belonging to the same genus as Feline panleukopenia virus include Canine parvovirus type 2, Porcine parvovirus, Mink enteritis virus, and Raccoon enteritis virus. Virus Structure: Feline