Top 10 Deadly Diseases of the 21st Century
A few of the deadliest diseases ranked according to the death tolls are listed below. These killer diseases are claiming innocent lives since ages. These obey no boundaries of age, sex, race, religion and caste.
1. Lower Respiratory Infections
Diseases like Pneumonia and others affecting the windpipe, lungs or the bronchial tubes are all categorized under the lower respiratory infections. These diseases shoot down more than 4 million lives every year. Most of these diseases are communicable which spreads through sneezing, coughing, laughing or exhaling.
All people who are HIV (human immunodeficiency virus) positive, do not die of AIDS (acquired immunodeficiency syndrome). About 39.4 million people live with HIV globally. Infection with the HIV leads to AIDS.
Mosquitoes are the carriers of the infection which can lead to death if left unattended.
Diarrhoea can be a symptom of bacterial, viral or parasitic infections. Uncontrolled and untreated diarrhoea lead to dehydration, which is the cause of maximum number of deaths in children.
The common symptoms of TB are – chronic cough, fever, chills, weakness and weight loss. TB is also communicable which spreads through coughing and sneezing.
Annually 530,000 people die from measles, which include mostly children. Untreated measles can lead to blindness or brain damage resulting in fatal outcomes. Children are even found victims of pneumonia and diarrhoea.
7. Whooping Cough or Pertussis
Whooping cough is highly contagious caused by bacterial infection at the respiratory tract. The disease can spread through talking, sneezing and coughing.
Most people call it lockjaw. The central nervous system is affected by the infection resulting in deaths. Prolonged contraction of skeletal muscle fibres is a characteristic sign of tetanus. Wound contamination is the mode through which the infection enters the body.
Meningitis claims thousands of lives every year out of a million of infected cases. The tissues covering the brain and the spinal cord are infected. Droplets from the throat, mouth or nose of an infected person helps in spreading the infection. Close contact and sharing can also communicate the disease to a healthy person.
Syphilis accounts for around hundred thousands of deaths in a year, affecting millions of people worldwide. Syphilis spreads through sexual contact with an infected person and can also transmitted from an infected mother to her child. This disease was also named as the “Great Imitator” because of its confusion with other diseases.
Top Deadly Diseases of the Developing World
|S.No.||Disease||Annual mortality rate||Annual infection rate|
|1.||Lower Respiratory Infections||4 million||–|
|2.||HIV/AIDS||3 million||39.4 million|
|3.||Malaria||1–5 million||300–515 million|
|4.||Diarrhea||2.2 million||4 billion|
|5.||Tuberculosis||2 million||8 million|
|7.||Whooping cough||200,000–300,000||20–40 million|
|9.||Meningitis||174,000||1 million +|