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Influenza in pigs is a respiratory disease similar to influenza in humans and is found worldwide. Asymptomatic infections are common. Symptoms typically appear 1–3 days after infection and include fever, lethargy, anorexia, weight loss, labored breathing, coughing, sneezing, and nasal discharge. In sows, pregnancy may be aborted.
The following outline is provided as an overview of and topical guide to concepts related to infectious diseases in humans.. Infection – transmission, entry/invasion after evading/overcoming defense, establishment, and replication of disease-causing microscopic organisms (pathogens) inside a host organism, and the reaction of host tissues to them and to the toxins they produce.
The CDC classifies flu viruses as A, B, C, and D. Types A and B are seasonal flu, and influenza A is broken down further into subtypes and strains. For example, current subtypes include H1N1 and H3N2.
While sometimes confused with the common cold, influenza is a much more severe disease and is caused by a different type of virus. [8] Although nausea and vomiting can be produced, especially in children, [7] these symptoms are more characteristic of the unrelated gastroenteritis, which is sometimes called "stomach flu" or "24-hour flu." [9]
It's flu season right now, and the U.S. is in the midst of a wave that's straining hospitals. But not all influenza is the same. There are some notable differences between flu A and flu B strains ...
An infectious disease, also known as a transmissible disease or communicable disease, is an illness resulting from an infection. Infections can be caused by a wide range of pathogens , most prominently bacteria and viruses . [ 2 ]
There are four different types of influenza virus: A, B, C, and D. Influenza C usually causes only mild illness while D mostly affects animals, especially cattle.
Influenza viruses A and B are estimated to have diverged from a single ancestor around 4,000 years ago, while the ancestor of influenza viruses A and B and the ancestor of influenza virus C are estimated to have diverged from a common ancestor around 8,000 years ago. [40] Outbreaks of influenza-like disease can be found throughout recorded history.