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Potential therapeutic approach of intravenous immunoglobulin against COVID-19
Allergy, Asthma & Clinical Immunology volume 17, Article number: 105 (2021)
Since the outbreak of the novel coronavirus disease (COVID-19), the therapeutic and management options to reduce the burden of the COVID-19 disease are under investigation. IVIG therapy is used as an effective treatment for immunodeficient patients and patients with inflammatory or autoimmune conditions. The therapeutic effect of IVIG in COVID-19 patients has been investigated. But, the results are controversial and some studies reported no benefit of IVIG therapy. More clinical trials on the effect of IVIG therapy in COVID-19 patients should be performed to establish a certain conclusion about IVIG effectiveness.
In late 2019, a new type of Coronavirus, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), was introduced and soon gave rise to a world-level pandemic . As of today, the case fatality ratio (CFR) of COVID-19 ranges from less than 0.1% to more than 25% varying between countries, and the overall CFR is probably around 1% [2, 3]. This led to a global lockdown and detailed study of the disease and attempts to provide a treatment or vaccine .
A major pathophysiological finding in relatively more severe COVID-19 patients has been hyper inflammation, which will be targeted in this study. Elevated levels of interleukin (IL)-2, IL-6, IL-7, interferon-gamma (IFN-γ) inducible protein 10 (IP-10), and tumor necrosis factor-alpha (TNF-α) indicates a cytokine cascade and a cytokine release syndrome as an underlying immunopathology [5, 6]. Furthermore, the elevation of C-reactive protein (CRP), lactate dehydrogenase (LDH), D-dimer, and ferritin in infected patients, showed more evidence of a hyperinflammatory state [7, 8]. This systemic inflammation gives rise to the infiltration of monocytes and lymphocytes in the lung and the heart. Particularly, pathogenic granulocyte–macrophage colony-stimulating factor (GM-CSF)-secreting T-cells were shown to correlate with the recruitment of inflammatory IL-6-secreting monocytes and severe lung pathology in COVID-19 patients .
In the 1960s, a new method of treatment for inflammation-related diseases was introduced.  Immunoglobulin therapy (IVIG) is based on the intravenous injection of human immunoglobulin to patients suffering from specific inflammatory conditions. IVIG is a pool of collected antibodies (IgG types) from healthy donors . Generally, plasma of multiple healthy donors was used to extract immunoglobulin for IVIG therapy; nevertheless, it has been suggested that plasma of the people who have recovered from severe viral infections may be more effective . We performed this review to summarize recent studies and knowledge about the effectiveness of IVIG treatment for COVID-19.
IVIG: definition, structure, and role in the treatment
IVIG is routinely used as an effective treatment for primary immunodeficiency, immune thrombocytopenic purpura, Kawasaki disease, dermatomyositis, and Guillain-Barré syndrome primarily as an antibody moderator . IVIG is administered in two distinct types of conditions with specific doses. First, it can be used as replacement therapy with a peak serum level of 12–14 mg/ml for immunodeficient patients. Second, administering a high dose of IVIG to reach a serum level of 25–35 mg/ml can be used in patients with inflammatory or autoimmune conditions. IVIG therapy generally functions as a replacement for the missing antibodies in the first type of administration (replacement therapy). However, it has other roles, such as normalizing monocyte differentiation toward DC  and inducing proliferation of B cells and antibody production in CVID patients.
Moreover, IVIG therapy has multi-level effects on the immune system in the second type (high-dose IVIG). It has been shown that the positive effects of the IVIG therapy remain far beyond the IgG half-life, which extends IVIG function from a simple injection of antibodies to a more stable and effective method of treatment . Furthermore, IVIG can modulate the immune response by suppressing the Th17 response and expanding regulatory T-cells through induction of cyclo-oxygenase-2-dependent prostaglandin E2 production in dendritic cells. Another proposed mechanism is the blockage of Fas-mediated cell death, causing a decrease in inflammatory reactions [16, 17]. A more recent study has shown that immunoglobulins can decrease the ability of activated T cells in engaging with microglia, a mechanism that led to the detection of lower levels of tumor necrosis factor-alpha and interleukin-10 in T-cell- microglia co-culture .
It was found that continuous injection of IVIG influences the process of lymphocyte differentiation and maturation, which finally leads to the normal immune response of white blood cells and prevents the production of inflammatory factors. Therefore, it decreases the injury caused by inflammation [19,20,21].
Previous experiences of using IVIG for respiratory syndromes
Several studies have reported the results of IVIG therapy in different respiratory syndromes, including severe acute respiratory syndrome (SARS), Middle East respiratory syndrome (MERS), acute respiratory distress syndrome (ARDS), influenza pandemics, and seasonal influenza [22, 23]. There is no adequate evidence to confirm that using IVIG is beneficial for SARS patients [24, 25], however, there are controversies about using IVIG against MERS [26, 27].
As an adjunct treatment in severe influenza, IVIG is an efficacious treatment for the pulmonary lesions in influenza pneumonia and Mycoplasma pneumoniae pneumonia [28,29,30]. Prevention of the disease progression and rapid improvement following IVIG therapy combined with conventional antibiotic therapy has been demonstrated in M. pneumoniae pneumonia. Moreover, the advantage of IVIG therapy in the early phase of the disease in patients unresponsive to corticosteroid and initial antibiotic therapy has been reported .
Studies highlight the advantage of systemic immune modulators like IVIG and corticosteroids in the acute phase of the ARDS. Reduced morbidity, inhibition of disease progression, and preventing permanent systemic organ injury are identified as outcomes of these treatments under sufficient dose and early administration . On the contrary, other studies reported no beneficial effect in ARDS patients [32, 33], and the guideline of sepsis treatment has not suggested administration of IVIG . Therefore, IVIG treatment in ARDS patients is still debatable.
Experiences of using IVIG in the treatment of COVID-19
In the three cases reported by Cao et al. as well as the reported case of COVID-19 with mucous membrane pemphigoid (MMP) by Daneshpazhooh et al., administration of IVIG improved the condition rapidly and showed its effect primarily by reducing patients’ fever. All the cases above were discharged in less than a week with considerable improvements [35, 36]. Furthermore, a case report by Shi et al. indicated that plasma exchange (PE) followed by IVIG provides clinical benefit for severe COVID-19 .
In line with these findings, Mohtadi et al. reported 5 cases of COVID-19, in whom administering hydroxychloroquine and antibacterial agents failed to improve the condition. Patients received IVIG at the dose of 0.3–0.5 g/kg for five days, in a way that no one received less than 25 g of IVIG. The clinical condition ameliorated markedly so that the patients were discharged from the hospital after that .
Another study reported a reduction in 28-day-mortality rates, the length of hospital stay, and the need for mechanical ventilation by IVIG treatment within 48 h after admission. However, IVIG administration in 24 h did not show this result. This highlights the relation between the time of IVIG administration and the mitigation of the mortality rate .
Furthermore, a multicenter retrospective cohort study by Shao et al. included 325 patients, from which 174 cases received IVIG. Consequently, only patients with severe COVID-19 from the IVIG group had better 28-day mortality rates. No effects were apparent on the total duration of the disease or the length of hospital stay . A recent systematic review performed by Mansourabadi et al. suggested using IVIG therapy combined with antiviral drugs, according to the 63 cases of COVID-19 reported in the literature, who were successfully treated with IVIG .
The studies mentioned above have limitations that make it difficult to persuade the use of IVIG. Two of the main confounding factors are the small sample size and the simultaneous administration of other therapy methods (such as glucocorticoids and plasma exchange). To achieve a more accurate result, Gharebaghi et al. have recently performed a randomized placebo-controlled double-blind clinical trial with a total of 59 patients. They found out that administering 20 g/day of IVIG for three days reduces mortality, despite increasing hospital stay duration. Patients in the IVIG group survived and stayed longer in the hospital until full recovery, while patients in the control group died earlier. They suggested IVIG treatment in patients who were not improved with the antiviral and chloroquine-class drugs, whose oxygen saturation is persistently under 90%, patients with more than 30% of lung involvement in CT scan, and patients whose lungs are progressively being involved in serial CT scans .
There are also a few studies highlighting the effect of IVIG on neurologic complications associated with COVID-19. A case report by El-Zein et al. described a 40-year-old man with SARS-CoV-2-associated meningitis/encephalitis infection whose condition markedly improved with administration of IVIG for five days . Muccioli et al. have performed a retrospective study on the data collected from patients developing encephalopathy who received IVIG at the dosage of 0.4 g/kg. Patients showed no adverse reactions to the therapy. All patients recovered completely after a mean time of 29.8 days. Improvements started to become evident in the first 3–4 days . The recent case report from Freire-Alvarez et al. also showed clinical improvement upon the usage of IVIG and cytokine blocking drugs in an acute demyelinating encephalomyelitis associated with COVID-19 . Considering the lack of clinical trials, it is difficult to conclude that IVIG usage upon COVID-19-related neurological manifestations is helpful.
Immunologic mechanisms of using IVIG in COVID-19 patients
Patients commonly go through three clinical stages of the COVID-19: the acute or pneumonia stage, the viremia stage, and the recovery stage. The possible pathogenesis of COVID-19 is that lymphocyte count in the early phase of the disease (1–14 days) is normal or slightly low . However, significant lymphopenia in the late phase (7–14 days after symptoms appear) occurs when viremia takes place. Furthermore, B lymphocyte reduction is observed during the early stage . One of the diagnostic methods for COVID-19 is antibody measurement in patients’ serum. Most evidence indicates that a higher level of SARS-2-COVID-IgG is a marker of severe disease (although for unclear reasons at the moment) and antibody levels are more diagnostic than therapeutic markers [42,43,44,45].
IVIG treatment inhibits inflammatory mechanisms, including reduced production of IL-6 [22, 35], TNF‐α production, T-cell activation, matrix metalloproteinase nine activity , and IL-12/23p40 in macrophages . On the other hand, anti-inflammatory mechanisms activate, for instance, the production of IL-10 in the gut and the macrophages and Peroxisome Proliferator-Activated Receptor gamma (PPARγ) increase. Simultaneously, the expression of Toll-like receptor-4 (TLR-4) is reduced [22, 35, 47]. It is determined that these effects of IVIG on the inflammatory storm do not incline patients towards immunosuppression . Furthermore, IVIG may affect COVID-19 development through prevention of dendritic cell maturation, reduced IL-12 expression, and increased IL-33, IL-4, and IL-13 production [22, 46, 47].
Challenges of using IVIG in COVID-19 patients
As mentioned earlier, several studies have shown the beneficial effects of using IVIG therapy against COVID-19 [36,37,38, 40,41,42,43,44,45, 48,49,50]. These studies are summarized in Table 1. Before describing the challenges of IVIG therapy, it is worth mentioning that not all the studies using IVIG as a treatment adjunct ended in positive results. Tables 2 and 3 illustrate the studies that reported no significant effect of IVIG and those that found inconclusive results.
Liu et al. found no notable impact on the patients with ARDS . Furthermore, neither IVIG nor antibiotics brought about an increase in survival rate in Pei et al. study . The systematic review performed by Zhang et al. found inconclusive results about the effectiveness of IVIG in COVID-19 . Moreover, no improvement in CT scan or the overall course of the disease was observed in Tabarsi et al. study, despite a reduction in the duration of hospitalization . Also, a review by Moradimajd et al. concluded that available literature is not enough to make the right decision about the efficacy of IVIG therapy in COVID-19 patients . These studies provide a base for counterarguments in the effectiveness of IVIG therapy in SARS-CoV-2 infection. Therefore, more randomized clinical trials should be performed to shed light on the IVIG efficacy.
In addition to the controversies in using the IVIG, some other challenges need to be discussed. First of all, the life of many immunodeficient patients depends on the IVIG lots . The COVID-19 pandemic inflicted additional pressure on the supply and demand balance, pushing it toward a shortage of IVIG . Furthermore, the high price of IVIG (approximately $100/g) added to the infusion costs, make it a relatively expensive therapy .
Second, adverse effects of IVIG do not arise very often but happen in 10% of patients. In rare cases, thromboembolism happened to the patients upon receiving IVIG. Since COVID-19 itself is a hypercoagulable state , it is recommended to add anti-coagulation medications to the treatment and keep the patient hydrated [60, 61].
Third, using intravenous immunoglobulins can suppress the normal antibody response in the patients, leading to ineffective immunization against COVID-19. As a result, even if the patient recovers from the COVID-19, he/she may still be vulnerable and must be vaccinated as soon as possible .
Fourth, If the sera collected from the general population lacks the anti-SARS-CoV-2 antibodies, its use provides no benefit . Sera derived from SARS patients  and sera before the pandemic  have no cross-neutralization with SARS-CoV-2 . Conversely, Diez et al. claimed that the Gamunex®-C and Flebogamma® DIF (Grifols) intravenous immunoglobulin (IVIG) products, manufactured before the pandemic, cross-neutralize SARS, MERS, and the newly emerged SARS-CoV-2 . The rationale behind this difference could be the dissimilarity of study methods, as Diez et al.  used antigens from EIA kits instead of virus-infected cells .
Some other risks should be considered too. Transferring of pathogens, serum sickness, transfusion-related acute lung injury (TRALI) [67, 68], and antibody-dependent enhancement (ADE). ADE requires prior exposure to similar antigens, suggesting that sera-containing antibodies against other coronaviruses may play a role in this phenomenon. But, it is still debatable that whether the IVIG can promote ADE or not [62, 69, 70].
In conclusion, it is still difficult to determine whether or not IVIG should be included in the treatment strategy of COVID-19 patients. More randomized clinical trials with large sample sizes are required to decide the amount of IVIG efficacy.
This study does not recommend IVIG therapy as a definitive cure for the acute phase of COVID-19 but instead summarizes the evidence and gives clues for upcoming trials. Several studies reported the advantage of IVIG therapy for COVID-19 patients. However, these studies are primarily case reports with small sample sizes and uncontrolled confounding factors. These uncertainties and the shortage of IVIG supply and its high cost suggest that its use must be supported with strong evidence. Therefore, more clinical trials on the effect of IVIG therapy in COVID-19 patients should be performed to establish a certain conclusion about IVIG effectiveness.
Availability of data and materials
Data of patient is available, if needed.
Antibody-dependent cellular cytotoxicity
Antibody- dependent Enhancement
Acute respiratory distress syndrome
Extracorporeal membrane oxygenation
Granulocyte–macrophage colony-stimulating factor
Inducible protein 10
Low molecular weight heparin
Middle East respiratory syndrome
Severe acute respiratory syndrome
Severe acute respiratory syndrome coronavirus 2
Tumor necrosis factor-alpha
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Kolahchi, Z., Sohrabi, H., Ekrami Nasab, S. et al. Potential therapeutic approach of intravenous immunoglobulin against COVID-19. Allergy Asthma Clin Immunol 17, 105 (2021). https://doi.org/10.1186/s13223-021-00609-3
- Coronavirus disease
- Intravenous immunoglobulin
- Respiratory syndromes