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Case Cluster of RT-PCR COVID-19 Positive Patients with an Unexpected Benign Clinical Course With...

Updated: Sep 25, 2021


The SARS-COV-2 global pandemic has been noted to have a differential effect on those exposed depending on risk factors such as age, diabetes, cardiovascular disease, and cancer.

Case presentation:

We report a case series of 12 confirmed positive patients and 12 presumptive positive patients all of whom had either an entirely asymptomatic or relatively mild clinical course. 2 patients had active cancer, 3 patients were cancer survivors, 1 patient without cancer was 74 years old. All patients were treated early in their disease course with vitamin D loading (50,000iu daily for 3 days), 60 to 240mg melatonin, and 2000mg oral vitamin C. The 6 high-risk patients and one 59-year-old patient were treated with at least 2 intravenous doses of vitamin C. The 2 patients with active cancer received 75 grams of vitamin C (one daily, the other every other day). All of the high-risk patients had a nearly asymptomatic clinical course and were tested after 10 days and all had an RT PCR for COVID-19 that was negative. The 17 remaining patients also had a relatively benign course though 4 patients (2 in their 20s, 2 in their 50s) received this treatment course later in the course of their illness, these were notably the only patients who had more than a mild sore throat or low-grade fever.


We report these unexpectedly positive clinical outcomes of COVID-19 patients including patients with different risk factors, under supplemental vitamin C and D and melatonin. These supplements have a favorable safety profile and are already being suggested as potentially disease-altering therapies in the ongoing COVID-19 pandemic.


Since the outbreak of the December 2019 SARS-CoV-2 virus and subsequent pandemic, there have been to date millions of people infected and over 2 million deaths as of 2/3/20211. Typical symptoms of COVID-19 are fever, cough, sore throat, and fatigue2, with some experiencing gastrointestinal distress3. These symptoms can progress to pneumonia and ARDS. The virus does infect children and young adults with usually, but not always, a mild disease course. Overall it is estimated that 81% of COVID-19 cases are mild, 14% of cases have severe symptoms and another 5% are critically ill. In the elderly as well as in people with current and past cancer diagnoses the disease course is often more severe. It is estimated that of those infected, around 8% of people in their 50s, 12% of those in their 60s, and 16.6% of those in their 70s would require hospital care4. One study noted that having a current malignant tumor placed a patient at a 39% risk of ICU admission, mechanical ventilation, or death5. Having cancer with recent chemotherapy or surgery conferred a 75% risk6 while being a cancer

Case Presentation Our case series includes 24 patients. 12 were confirmed positive with RT-PCR nasopharyngeal swab testing. 12 were close contacts with known positives and were presumed positive. Initial cases were exposed to COVID-19 at an integrative medicine outpatient clinic where they were either receiving care or working. Subsequent cases were friends and family members in direct contact with the initial cases. Our reported cases contain both lower risk children and higher risk cancer patients, cancer survivors, and the elderly. 13 out of 24 cases had mild symptoms with most occurring in the younger segment. The two patients with active cancer were receiving intravenous infusions of mistletoe (Viscum album) and vitamin C for their potential therapeutic effects in cancer. The patient with lung cancer (case 11 in Figure 1) had received radiation therapy and a bronchial stent for a collapsed lung 2 weeks before he arrived at our clinic on day 5. He had a moderate pleural effusion noted on a recent CT scan and consistent with the clinical exam. He was using hydroxychloroquine at 200mg twice daily as a repurposed medication in cancer due to its purported inhibition of autophagic flux20. He received intravenous vitamin C at 75 grams per infusion before or concurrent with his suspected exposure. The table below lists the age, comorbidity, and symptoms of our cases. Only one patient (number 22 in Figure 1) had a history of hypertension and was on an ACE inhibitor. No patient was in either extreme of BMI.

Management and Outcome

Every adult case except the index case was treated with vitamin D dosed at 50,000iu per day for 3 days. Children were given 20,000iu/day for 3 days. Oral vitamin C was used at 2000mg/day divided through the day to prevent loose stools. Melatonin was used in all patients with cancer or respiratory symptoms. Doses from 60mg to 240mg per day were used. Intravenous vitamin C was given to 2 patients age 50-59, and all patients over 60. In patients without active cancer, vitamin C was given at 15 grams twice over the first week of diagnosis. Both patients with active cancer were receiving more vitamin C as therapies for their cancer- one was getting 75 grams 5 days per week, the other 75 grams 3 days per week. They both were receiving intravenous mistletoe and a third cancer survivor was injecting mistletoe subcutaneously. As the patients felt well they were tested after 7-10 days and found to be negative for COVID-19. Two patients in their 20s (case 1 and 2) and two in their 50s (case 15 and 16) had somewhat more pronounced symptoms. These were all patients who started the vitamin D late or not at all due to a delay in diagnosis. Case 1 was not directly under our care but reported that she had several days of sore throat and sinus congestion. She continued to test positive on day 31. Case 5 had a negative swab 24 hours before a second swab resulted positive. This case had 4 days of mild symptoms and tested negative 8 days later. Viral shedding in patients with COVID-19 is not yet well characterized but one report found that the median viral shedding of hospitalized patients was 15 days with sicker patients tending to shed for longer.21 It is not possible to accurately estimate the duration of viral shedding of our case cluster. Cases 2, 15, and 16 noticed relief in symptoms after vitamin D supplementation. On three occasions Case 5 reported improvement in his breathing about 2 hours after use of high dose melatonin. Neither patient with active cancer had any symptoms at all. Case 11 had resolution of his pleural effusion confirmed with a chest film day 29 and noted improvement of his breathing despite testing positive for COVID-19. A few cases noted that high dose melatonin caused daytime sleepiness but did not impair daily activities or lower vigilance. No other side effects of the interventions were reported. As the patients were not very ill, bloodwork was not pursued in this patient cluster. No case required hospitalization and all reported they would not have suspected they were infected with COVID-19 if not for having had a positive test.


The surprisingly benign clinical course of all of these patients, including those at high risk of severe disease, under treatment with the supplements vitamin C, D and melatonin ask for an exploration of such therapies in the use of COVID-19 patients. Vitamin D loading was the therapy most universal. High-dose melatonin and intravenous vitamin C were given to all higher-risk patients. All of these therapies are relatively inexpensive, safe if dosed properly, and widely available. Vitamin C is well tolerated with possible side effects of nausea, diarrhea, and gastrointestinal side effects at high oral doses over 2 grams in adults22. Vitamin C has been found to scavenge free radicals and neutralize inflammatory cytokines- attributes that could hypothetically help against the striking levels of inflammation that occur in COVID-19. Vitamin D has been found in a large meta-analysis to protect against respiratory infections and has a role in modulating the immune response- both strengthening innate immunity and decreasing inflammation from immune activity23. Melatonin influences immune metabolic pathways to create a less inflammatory situation- potentially countering cytokine storm and having relevance in COVID-19 though more clinical research is needed in this field24. Three of the highest risk patients were also using the Viscum album. Viscum album is a European mistletoe extract and is used commonly as an adjunctive cancer therapy mainly by subcutaneous and intravenous routes. It has been found to reduce inflammation through COX 2 specific effects2526Viscum album has a stimulating effect on T cells and immune function in general27. All of these therapies have a potential impact on the immune system’s interaction with the SARS-CoV-2 virus that could have attenuated the disease course

Using early case detection to direct Vitamin D supplementation and selective early intravenous Vitamin C and melatonin might have been a safe and effective way to decrease morbidity and mortality from COVID infection in our cases. The use of the Viscum album in those with cancer may have also given a protective effect. These interventions need to be explored further with trials, especially as they all have a favorable safety profile and do not cost-prohibitive

Credited to: Mark Hancock MD

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