Post-COVID-19 illness

There have been some reports of long term illness in survivors of COVID-19; it is unclear how many people are affected at this stage. One small study from Wuhan, China, found that survivors of COVID-19 who tested negative twice before discharge from hospital still had some abnormalities in metabolism and liver function markers when discharged.

Relapse or reinfection
Some patients have described feeling fully recovered, then experiencing COVID-19 symptoms again, and feeling like their lungs were "on fire" for some weeks afterwards. There is uncertainty about whether this is a relapse due to the virus remaining at low levels in the body and bring reactivated, or if this is a reinfection.

Post-SARS illness
COVID-19 is caused by the SARS-CoV-2 virus; the similar SARS-CoV coronavirus causes SARS, and SARS is known to have caused long term illness in some survivors, including chronic fatigue syndrome and a post-SARS syndrome similar to fibromyalgia involving chronic widespread musculoskeletal pain, fatigue, depression and disordered sleep.

ICU survivors
Long term physical, cognitive and mental health problems have also been found to be relatively common in patients discharged from intensive care from illnesses other than COVID-19, with the length of time in intensive care influencing the long term health impacts. Post Intensive Care Syndrome (PICS) is one of several conditions that can result, and requires both short and medium term rehabilitation treatments.

COVID-19 pneumonia and SARI
Moderately ill patients with COVID-19 may develop mild viral pneumonia. Severe acute respiratory infection (SARI) is known to develop in some people severely ill with COVID-19. SARI resulting from other illnesses has been studied.

Acute respiratory distress syndrome
Acute respiratory distress syndrome (ARDS) is a life-threatening condition that involves the patient's lungs becoming inflamed, and being unable to produce enough oxygen for the body's vital organs. ARDS develops in 17-29% of hospitalized COVID-19 patients and is known to have long term effects. ARDS can cause nerve and muscle damage, which causes pain and weakness.

Mechanical ventilator effects
Invasive ventilation using a mechanical ventilator was needed by 47-71% of patients admitted to Intensive Care Units.

COVID-19 complications
These include:
 * Anecdotal reports of DVT and PE in critically ill patients
 * Central nervous system encephalitis and encephalomyelitis
 * anecdotal evidence of pulmonary aspergillosis
 * pneumonia
 * hypoxemic respiratory failure/ARDS
 * sepsis and septic shock
 * cardiomyopathy and arrhythmia
 * acute kidney injury
 * complications from prolonged hospitalization including:
 * secondary infections including bacterial and fungal infections
 * thromboembolism
 * gastrointestinal bleeding
 * critical illness polyneuropathy/myopathy.

Fatigue after COVID-19
COVID-19 can cause severe fatigue, however experiencing fatigue after recovering from the virus should not be the considered the same as the illness chronic fatigue syndrome (CFS) or myalgic encephalomyelitis (ME), a neurological disease involving multiple bodily systems and sustained symptoms over an extended period of time. Post-viral fatigue which does not meet the criteria for CFS or ME and lasts at least 6 months is known as chronic fatigue (without the "syndrome"), or idiopathic chronic fatigue if the cause is unknown.

ME/CFS
Myalgic encephalomyelitis, better known as ME, is a neurological disease that commonly begins after a virus, although other possible triggers include bacterial infections, injuries, surgery and other events. Some researchers and some patients use the term chronic fatigue syndrome (CFS), or ME/CFS to refer to ME, although there are differing diagnostic criteria. The older term Postviral fatigue syndrome (PVFS) is rarely used, although the World Health Organization recognize PVFS, ME, and CFS using the same diagnostic code. Some countries including the United States, deviate from this.

Moldofsky et al. (2011) conducted a long term follow up of 21 SARS survivors in Toronto, Canada, all of who remained too ill to return to work, and concluded that that chronic post-SARS was similar to fibromyalgia. Lam et al. (2009) conducted a much larger long term follow-up of SARS survivors in Hong Kong, and reported that 27% had chronic fatigue syndrome, 40% had chronic fatigue, and 40% has depression. A number of the SARS survivors unable to return to work were previously healthy health-care workers. The high rates of chronic fatigue could not be accounted got by depression or psychiatric illness.

Treatment
No treatment studies have yet been published, despite this and the uncertainty over long term physical and psychological health consequences of coronavirus disease 19 (COVID-19), some self-help advice has already been published.

CBT and GET
Public health expert David Tuller has strongly criticized a leaflet by Oxford NHS Trust which refers to chronic fatigue syndrome, a neurological disease, as a possible mental health consequence of COVID-19, and recommends cognitive behavioral therapy (CBT) —a psychological therapy based on the assumption that there is no lasting physical damage or illness. Also recommended in the leaflet is graded exercise therapy (GET), a physical treatment which is even more controversial and has been found to cause most patients with chronic fatigue syndrome not resulting from COVID-19 to deteriorate - GET is also based on the deconditioning theory that assumes there is no lasting physical damage and that all symptoms are the result of lack of activity and/or excessively paying attention to symptoms; GET states activity should be gradually increased and signs of deterioration should be ignored. CBT and GET are no longer recommended by the CDC, and their use within the UK's National Health Service is currently under review, with many concerns having been raised about high rates of patient harm resulting from these treatments, and a lack of effectiveness. CBT and GET they are not recommended by the UK's ME Association, Action for ME, Invest in ME Research, MEAction, or The 25% ME Group.

Pacing
Less controversially, the self-help leaflet mentions pacing, a symptom-management approach also without evidence for COVID-19 survivors, but which is used by many people with chronic fatigue, chronic pain, and/or persistent illness that limits their everyday activities. ME patient associations surveys have found pacing helped most, but not all, patients.

Notable studies
No studies have yet been completed on the impact of COVID-19 on the long term health of survivors, or on treatment approaches.

News articles and blogs

 * Mar 28, 2020, 'Post intensive-care syndrome': Why some COVID-19 patients may face problems even after recovery - Erika Edwards, NBC News
 * Apr 2, 2020, Will COVID-19 -19 leave an explosion of ME/CFS cases in its wake? - blog by Cort Johnson
 * Apr 13, 2020, We Need to Talk About What Coronavirus Recoveries Look Like - Fiona Lowenstein, New York Times Opinion
 * Apr 15, 2020, Coronavirus destroys lungs. But doctors are finding its damage in kidneys, hearts and elsewhere - Lenny Bernstein, Carolyn Y. Johnson, Sarah Kaplan and Laurie McGinley, Washington Post
 * Apr 15, 2020, Could the coronavirus trigger post-viral fatigue syndromes? - Clare Wilson, New Scientist
 * Apr 16, 2020, Those Who Get COVID-19 and Get Healed Can Face Another Disease After A Few Years - Daniel Kucher - SOMAG news
 * Apr 16, 2020, Trial By Error: Oxford-NHS Recommends GET/CBT for Post-COVID “CFS” Patients
 * Apr 17, 2020, Coronavirus survivors say they fear long-term effects - Melissa Malamut, New York Post
 * Apr 17, 2020, What we know about coronavirus' long-term effects - Erin Shumaker, ABC news

Learn more

 * Coronavirus disease 19 (SARS-CoV-2) - John Hopkins University