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Coronavirus effects on body organs

Date: 27 April 2020 Tags: Miscellaneous


As the number of confirmed cases of coronavirus (COVID-19) crosses 2.7 million and that of deaths is fast approaching 192,000, physicians are beginning to realise that lungs are just the ground zero for the virus while the virus spreads its lethal tentacles to multiple organs.



  • While about 80% of people infected with the virus either don’t display any symptoms or only mild symptoms, the remaining need hospitalisation and about 5% need ICU care.

  • Who would need hospitalisation and even ICU care depends on how decisively the body strikes down the virus soon after infection.

  • If not beaten back in the initial stage of infection, the virus invades the lower respiratory tract and enters the lungs, which very soon turns into a battle ground.

  • The virus enters the cells by binding to receptors found on certain cells called angiotensin-converting enzyme 2 (ACE2). The lining of the nose is rich in cells with this receptor and hence is the site of entry into the body. The receptors are found in cells found in many other organs, thus leaving them too vulnerable.

  • The tiny air sacs in the lungs called the alveoli, where oxygen exchange between the lungs and blood vessels take place, are rich in ACE2 receptors. Once the virus enters these cells, the immune system mounts an all out battle against the virus, disrupting the oxygen transfer and leaving the air sacs with fluid and dead cells, which makes breathing shallow and difficult and accompanied with coughing.

  • While some patients survive without further complications once provided with external oxygen support, some others deteriorate further, developing a condition called acute respiratory distress syndrome.

  • Oxygen levels drop sharply and breathing becomes harder. The lungs are by now riddled with fluid white blood cells, mucus, and the detritus of destroyed lung cells instead of air. Many patients end up on ventilators, and while some survive the rest either die or their condition worsens further.

  • Patients experiencing worsening conditions typically have their immune system overreacting and bringing on a “cytokine storm”, where the level of cytokines far exceed the levels needed resulting in healthy tissues being attacked.

  • Heart is one of the organs that gets affected after lungs. The disruption seems to extend to the blood itself, causing blood clots, which when breaks can restrict the blood supply to the brain causing stroke or artery supplying blood to the lungs causing pulmonary embolism.

  • Surprisingly, asthmatics or patients with other respiratory diseases are not at great risk unlike those with vascular problems — diabetes, obesity, age, hypertension. 

  • Kidneys too are very vulnerable and experience in China shows that a sizeable fraction of patients may suffer from kidney failure. It could be due to direct infection by the virus, cytokine storms reducing blood supply to the kidneys, or pre-existing diabetes causing fatal damage to kidneys.

  • A small subset (5%-10%) of patients suffer from neurological problems — seizure-like symptoms, strokes, loss of sense of smell and taste, and at times even depression of brain stem reflex, which is responsible for sensing oxygen starvation. In rare cases, the virus finds its way into the cerebrospinal fluid causing meningitis and encephalitis.

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