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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.
Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.
Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.
![The wolf spider, Lycosa godeffroyi, is common in many areas of Australia. In this family of spiders,](https://biology-forums.com/gallery/47/medium_27605_22_04_12_6_41_34.jpeg)
![Lestidae is a rather small family of cosmopolitan, large-sized, slender damselflies. They are of the](https://biology-forums.com/gallery/47/medium_12359_26_04_12_9_45_30.jpeg)