### condition | illness | disease:

Influenza
* Most influenza causes illnesses
  - severe illnesses
  - has rapid onsets
  - occurs in mammals
* Some influenza affects internal organs
* Some influenza affects several internal organs
* Some influenza causes death
  - severe diseases
  - occurs in intestines
* accounts for millions of days lost from work each year
  - lost work days each year
* affects both sexes and all ages
  - up to one-quarter of the U.S. population each year
* also spreads widely in North America, the West Indies and Spanish America.
* bad disease with a good vaccine.
* can a serious illness.
* can affect anyone
  - both sexes, all ages, but it is unusual in infants
* can also lead to a secondary bacterial pneumonia
  - other diseases , such as pneumonia
  - pneumonia and death
  - worsen other problems such as diabetes, chronic bronchitis or heart failure
  - cause bronchitis, pneumonia and ear infections, leading to missed classes or exams
* can cause fever, chills, cough, sore throat, headache, and muscle aches
  - cough, chills, headache, muscle aches, sore throat
  - sore throat, cough, chills, headache, or muscle aches
  - develop into bronchitis or bacterial pneumonia
  - do more than lay children flat on their backs
  - enhance the underlying medical conditions, such as heart or lung disease
  - have much more serious consequences than other viruses prevalent in fall and winter
  - in fact be life threatening for some
  - increase a patient s susceptibility to pneumonia
  - lead to hospitalization or even death, especially among the elderly
* can lead to pneumonia or death, especially for the elderly
  - especially in the elderly
  - which can be fatal
* can lead to serious complications such as pneumonia and death
  - make people of any age ill
  - occur throughout the year in the tropics
* causes a coldlike upper respiratory infection.
* causes epidemics resulting in disease and death in susceptible individuals each winter
  - worldwide every year
  - extra hospitalizations in people with chronic diseases such as asthma
* causes fever, chills, headache, muscle ache, sore throat, cough, and cold symptoms
  - coughs, chills, sore throat, headache, and muscle aches
  - many deaths each year
  - thousands of deaths each year, mostly among the elderly
* common and frequently debilitating condition.
* common, upper-respiratory disease started by a viral infection.
* contagious disease caused by a virus
  - very small germs called a virus
  - lung disease caused by a virus
  - viral infection of the upper and lower respiratory tracts
* cytopathic virus.
* differs from the common cold.
* disease caused by viruses
  - characterized by respiratory and severe systemic symptoms
  - of antiquity that annually imposes a major burden of morbidity and mortality
* disease of the breathing passages caused by the influenza virus
  - respiratory system
  - upper respiratory tract
* has no specific treatment
  - seasonality in that it appears more often in the winter
* highly contagious disease of the respiratory tract
  - illness caused by a group of viruses called the orthomyxoviruses
* highly contagious respiratory infection
  - viral illness
* highly contagious viral infection of the nose, throat and lungs
  - that occurs in winter months north of the equator
  - contagious, acute viral infection of the upper respiratory tract
* highly infectious viral disease that is particularly common in the winter months
* includes coughs.
* is always a respiratory illness.
* is an acute infection of the respiratory tract caused by the influenza virus
  - respiratory illness caused by infection with an influenza virus
* is an acute respiratory infection caused by a variety of viruses
  - that can be caused by a variety of flu viruses
  - extremely contagious, acute, self-limited disease of the upper and lower airways
  - illness that is caused by one of several different viruses
* is an infection caused by a virus
  - infectious disease of major public health importance
  - unpleasant illness which can lead to death, mainly in the elderly
  - upper respiratory infection caused by a specific kind of virus
  - around every winter
  - at the pre-winter baseline levels
  - basically a pulmonary disease, i.e. a disease of the lungs
  - by far the most common disease of horses
* is characterized by a fever, headache, fatigue, chest discomfort and cough
  - high fever, headache, fatigue, chest discomfort and cough
  - abrupt onset of fever, headache, sore throat, cough, and muscle aches
  - fever, headaches, muscle aches, and fatigue and shivering
* is common in Europe and England
  - France
  - complicated by bacterial pneumonia
  - contagion
  - contagious respiratory disease caused by a new strain of virus each year
  - described as a serious disease that can lead to pneumonia and death
  - easy to prevent with vaccine
  - epidemic in Europe
  - from pigs, pertussis is from pigs
  - generally more frequent during the colder months of the year
* is highly contagious and can be spread by touch, a cough or a sneeze
  - cause serious complications like pneumonia
  - have serious complications such as pneumonia
  - is more common during the colder months of the year
  - contagious, meaning that it passes very easily from one person to another
  - infectious and spreads rapidly
  - in a constant state of mutation
  - infectious diseases
* is just a bad cold with more fever and muscle aches
  - another name for the flu
* is most common during winter
  - in the winter months when people are in close proximity to one another
  - contagious at the beginning
* is much more serious than the common cold
  - than a cough and cold
  - worse than a cold
  - one of the infectious diseases that peak during winter
* is one of the most contagious viruses found
  - rapidly transmitted diseases known to humans
  - oldest and most common diseases known to man
  - primarily a respiratory disease, but it also affects other parts of the body
  - probably the most devastating respiratory disease
  - respiratory diseases
* is spread by virus-infected droplets coughed or sneezed into the air
  - easily by coughing and sneezing
  - primarily by aerosols , but occasionally through a fomite
  - very easily from person to person primarily when a person coughs or sneezes
* is the fourth leading cause of death among elderly individuals
  - only documented zoonotic disease of ferrets
  - sixth leading cause of death in the United States
  - usually a more severe illness than the garden-variety cold
* is very contagious, and anyone can become infected
  - difficult to diagnose on the basis of clinical symptoms alone
* kills thousands each year and can be passed on by a simple sneeze
  - of people, mostly elderly, and affects millions of others every year
* lowers the body's resistance to infection.
* major cause of death among elderly persons
  - killer of individuals with compromised immune systems, especially the elderly
* model system for study.
* more serious disease caused by viruses that are different from cold viruses.
* much nastier disease than a lot of people realize.
* mutates at an alarming rate and new strains appear on an annual basis.
* non-eradicable disease as the wild birds of the world harbor all varieties.
  - seasonal epidemics
  - the winter season in temperate areas and year-round in the tropics
* occurs most often in the late fall and winter months
* particular virus in the orthomyxovirus family.
* potentially life-threatening, contagious disease that is caused by a virus
  - serious disease that can usually be prevented
* produces marked upper respiratory as well as general body symptoms.
* puts some people in hospital beds.
* remains a major cause of morbidity and mortality amongst the elderly
  - and mortality each year
  - worldwide problem because of frequent changes in the virus
* respiratory disease, but it affects the entire body.
* respiratory illness caused by a virus
  - influenza viruses
  - tract infection caused by a virus
* respiratory, tracheal, bronchial illness.
* seasonal illness in temperate climates.
* serious and life-threatening illness.
* serious disease that caused by a virus and is spread from infected persons to others
  - kills thousands of people worldwide
  - illness that can spread very quickly
* serious viral infection that can even cause death
* severe upper respiratory illness.
* shares many of the same symptoms as the common cold.
* shears off the delicate hair cells that line the respiratory tract.
* significant cause of mortality and morbidity in the United States.
* special type of zoonosis.
* spreads easily from person to person when an infected person coughs or sneezes
  - person, so it normally appears as an epidemic
* spreads rapidly because the virus is transmitted through airborne contamination
  - from person to person by air-born droplets carried in a cough or a sneeze
  - to Minnesota
  - very easily from an infected person to others through coughing and sneezing
* still passes between humans and shearwater gulls.
* syndrome that is caused by infection either influenza type A or B virus.
* systemic disease and for a small number of patients major complications can occur.
* tends to be very infectious and spread rapidly
  - start suddenly
* travels rapidly around the globe today.
* vaccines - A reappraisal of their use
* very serious disease
  - illness for anyone at high risk
* viral disease of the upper respiratory tract
  - that causes many illnesses each season
  - infection and antibiotics work only against bacterial infections
* viral infection that is highly contagious
  - typically causes significant disease that can be incapacitating
  - that's especially common in winter
* virus and is highly contagious in horses
  - very contagious in horses
  - infection of the throat, bronchial tubes, and lungs
* virus that causes the disease influenza
  - spreads from infected persons to the nose or throat of others
* virus, and therefore antibiotics have no effect on the flu.
* widespread and potentially devastating disease.
+ Influenza, Flu transmission and symptoms: Pulmonology :: Diseases caused by viruses
  * Human Influenza can pass from one person to another very easily. It is most commonly spread by the microscopic droplets of mucus and fluid that are sent into the air when the sick person coughs or sneezes. Symptoms include cough, sore throat, muscle aches and pains, fever, headache, and rarely vomiting and diarrhoea. Influenza can also lead to other diseases, such as pneumonia. This makes it especially dangerous to young children, and old people.