Is influenza still considered a public health threat?
Influenza (flu) is a major public health concern. Annually, flu causes illness in a substantial proportion of the U.S. population and may result in serious complications, including events leading to hospitalization and death. Influenza viruses are highly unpredictable.
Is influenza A life threatening?
Outlook. Type A influenza is a contagious viral infection that can cause life-threatening complications if left untreated. While some cases of this infection can improve without prescribed medication, a visit to your doctor is recommended.
Is flu a pandemic every year?
Epidemics of seasonal flu happen every year. Fall and winter is the time for flu in the United States. How often do flu pandemics occur? Flu pandemics happen rarely.
Why is influenza A public health threat?
The influenza pandemic refers to the introduction and later worldwide spread of a new influenza virus in the human population, which occurs sporadically. Due to the lack of immunity in humans against the new virus, serious epidemics can be provoked resulting in high morbidity and mortality rates.
Why is influenza A public health issue?
However, influenza represents a major public health issue due to the associated hospitalizations and excessively high number of deaths. Aging (>65 years old), comorbidities, pregnancy and compromised immune system are considered risk factors associated with higher rates of hospital admissions and mortality.
Is flu A or B worse?
Type A influenza is generally considered worse than type B influenza. This is because the symptoms are often more severe in type A influenza than in type B influenza. Type A influenza is more common than type B influenza.
How long does influenza A last?
Symptoms usually appear from one to four days after exposure to the virus, and they last five to seven days. For people who’ve had a flu shot, the symptoms may last a shorter amount of time, or be less severe. For other people, the symptoms may last longer. Even when symptoms resolve, you may continue to feel fatigued.
What causes influenza A?
What Causes the Flu? The flu is caused by influenza viruses that infect the nose, throat, and lungs. These viruses spread when people with flu cough, sneeze or talk, sending droplets with the virus into the air and potentially into the mouths or noses of people who are nearby.
What was the worst pandemic in history?
1. Plague of Justinian—No One Left to Die. Yersinia pestis, formerly pasteurella pestis, was the bacteria responsible for the plague.
What happens when a pandemic influenza virus emerges?
What happens when a pandemic influenza virus emerges? When a pandemic influenza virus emerges, the virus can spread quickly because most people will not be immune and a vaccine might not be widely available to offer immediate protection.
How long did the 1957 flu pandemic last?
The outbreak lasted on a pandemic level until about the middle of 1958 and caused an estimated one million to two million deaths worldwide. After 10 years of evolution that produced annual epidemics, the 1957 flu disappeared in 1968, only to be replaced by a new influenza A subtype, H3N2.