Guillain-Barré syndrome and SARS-COV2 coronavirus. Vaccinate or get infected with COVID? What poses less risk?

doi:10.21203/rs.3.rs-1415059/v1

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Guillain-Barré syndrome and SARS-COV2 coronavirus. Vaccinate or get infected with COVID? What poses less risk?

https://doi.org/10.21203/rs.3.rs-1415059/v1

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Introduction: Among the neurological diseases possibly associated with COVID-19 (coronavirus disease 2019) infection, Guillain-Barré syndrome has been postulated since the start of the pandemic, even more so when vaccination has also come into play.

Objectives: A bibliographic review is carried out to assess the true risks of suffering Guillain-Barré syndrome secondary to vaccination against SARS-COV2 (severe acute respiratory syndrome coronavirus 2) infection and of developing it secondary to SARS-COV2 infection.

Material and methods: A search for articles was carried out in the PubMed-MEDLINE database between June 2021 and July 2021.

Results: The scarcity of studies that can provide solid evidence stands out, with most of the publications being clinical case reports or case series. Two epidemiological studies with contradictory results stand out.

Conclusion: With the information currently available, it is not possible to conclude that there is an association between SARS-COV2 infection or secondary to vaccination with Guillain-Barré syndrome. Therefore, the recommendation to avoid vaccination for fear of a recurrence of Guillain-Barré syndrome does not seem to be normative at the present time.

COVID-19

SARS-COV-2

Guillain Barre syndrome

Pandemic

Causality

From the first moments of the COVID-19 pandemic (coronavirus disease 2019), there began to be a concern about the possible subsequent appearance of Guillain-Barré syndrome, in a similar way to what happens with other respiratory viruses (especially with Mycoplasma Pneumoniae(1) or the influenza virus(2)), in which case a second parallel pandemic would be generated. In the midst of the oversaturation of the health systems of practically all the countries of the world, it was difficult to be able to collect data that would early generate solid evidence on the possible association of these two entities, as well as the association of the infection by SARS-COV2 (severe acute respiratory syndrome coronavirus 2) and any other neurological process.

The COVID-19 vaccine race to curb the virulence of this pandemic pathogen suggested another question: Could these vaccines also be a cause of Guillain-Barré syndrome? And if so, how would you be less likely to develop it, secondary to direct infection or secondary to vaccination?*

Medical consultations received questions from patients who had previously suffered Guillain-Barré syndrome, and who had been informed at the time that the cause could be related to a vaccine or some type of infection in the previous weeks.. "Doctor, is vaccination safe for me?"

The only possible solution to this type of question would be to take one of the following ways: refering the patient to the Preventive Medicine Service, where the uncertainty was probably not resolved either; to expose a personal point of view neither based on evidence nor experience, given the rapid development of events; or, to confess simply the lack of serious knowledge about it.

The objective of this work is to carry out a review that allows estimating the risk of suffering Guillain-Barré syndrome secondary to vaccination against SARS-COV2 infection, respectly to developing it secondary to SARS-COV2 infection.

A search for articles was carried out in the PubMed-MEDLINE database between June 2021 and July 2021. The keywords used on the one hand were "COVID-19" or "SARS-COV2", and "Guillain-Barré", using the boolean operator “AND”; on the other hand, “COVID-19” or “SARS-COV2”, and “Guillain-Barré” and “vaccine” were used, using the boolean operator “AND” in each case.

The exclusion criteria were those articles not written in English or Spanish, or those that did not deal with humans (for example, research articles on animal models). The PRISMA(3) guideline was taken into account for systematic reviews.

A total of 405 results were obtained, of which 30 were duplicates, resulting in 375 results, and applying the exclusion criteria, the total number of assessable articles was 218 (Fig. 1). Of these, 6 corresponded to meta-analyses, 63 corresponded to reviews, and 24 to systematic reviews.

In the first place, the number of published case reports(4–10) stands out, on presumed Guillain-Barré syndrome secondary to COVID-19 infection, including the Miller-Fisher syndrome variant(11); from case series(12–15); as well as letters to the director or to the editor(16–17), through which it is not possible to establish strong evidence of a causal relationship given the absence of any type of statistical analysis, even more so considering the high prevalence (cumulative incidence in June 2021 of more than 170,000,000 cases worldwide) of SARS-COV2 infection in the areas where these cases occurred (Fig. 2), thus not being able to rule out the hypothesis that it was actually a simple coincidence(18–19) of two relatively frequent pathologies.

In addition, it is important to be able to adequately differentiate, in the case of patients affected by severe pneumonia, between critically ill neuropathy and Guillain-Barré syndrome, given the possible semiological overlap(20), especially considering that not all reported cases shows differentiating signs such as the classic albumin-cytological dissociation(21) in cerebrospinal fluid, as well as in many cases the typical latency time period of approximately 3 weeks from the causal infection and the appearance of neurological symptoms did not exist. For this reason, various sources call it early Guillain-Barré syndrome(22), and it is necessary to take into account the very possible diagnostic confusion.

However, the systematic reviews carried out do show a strong association between both pathologies, in addition, the studies analyzed emphasize differences in the presentation of the disease with greater severity in Guillain-Barré syndrome associated with COVID-19(23), compared to those described associated with other causes. In addition, an Italian multicenter observational study was published(24) that showed an increase in the incidence of Guillain-Barré syndrome from the start of the pandemic in northern Italy, supporting the existence of a link with this pathogen. They also agreed on the aforementioned observation that it usually presents more seriously than in cases precipitated by other causes. However, the confidence intervals overlapped due to the small sample size, and this small increase from previous years could be due to a chance finding(25).

To add even more confusion, we have an paper published in December 2020(26), which shows the results of a cohort study that found no association at all between Guillain-Barré syndrome and COVID-19 infection. The authors also did not find significant differences in the cases diagnosed during the pandemic, in terms of the pattern of weakness, latency time, neurophysiological patterns or findings in cerebrospinal fluid, compared to the cases diagnosed in the previous 3 years. Moreover, they corroborate a decrease in the incidence during the pandemic, which they explain as a consequence of the confinement measures adopted by the authorities, which would reduce the transmission of pathogens that induce Guillain-Barré syndrome, such as respiratory viruses or Campylobacter jejuni.

Generally, when measured, COVID-19 antibodies could not be determined in cerebrospinal fluid, except in one case(27). The viral amino acid sequence has been compared with human autoantigens associated with immune-mediated polyneuropathies, showing that the peptides that comprise the immunoreactive epitopes of SARS-COV2 share the same sequence as heat shock proteins 90 and 60 that are associated with Guillain-Barré syndrome(28–30). However, anti-ganglioside antibodies have only been detected very infrequently in some cases of Guillain-Barré syndrome associated with COVID19(31).

Regarding vaccination, the information we currently have is even scarcer than in the previous case, and even, of lower quality, highlighting some isolated case report published(32), some letter to the editor(33), and a study conducted in India(34), in which 80% of the population of Kerala (India) had received the ChAdOx1-S/nCov-19 vaccine. A period of 4 weeks (from March to April 2021) was evaluated in this population, observing 7 cases of Guillain-Barré syndrome, the incidence was therefore 1.4 to 10 times higher than that expected for such a period in a population of this magnitude. Guillain-Barré syndrome was also more severe, and the patients had frequently facial diplegia, a phenotype normally associated with post-vaccination Guillain-Barré syndrome(35).

On July 12, 2021, the FDA (Food and Drug Administration) referred that the Ad26.COV2.S (Janssen/Johnson & Johnson) vaccine registered an "increased risk" of Guillain-Barré syndrome. 100 cases were identified after the administration of 12.5 million doses of the vaccine. When making a critical reading, it is necessary to consider that if 4,000,000,000 people are immunized during a year, it would be expected that 68,000 cases of Guillain-Barré syndrome would occur naturally within this period, regardless of vaccination. Of these Guillain-Barré syndrome cases, 13,076 would occur in the 10-week window after double-dose vaccination with injections 4 weeks apart(36), which is even more than a hundred times more cases than reported by the FDA.

Therefore, more weighty, serious, epidemiological studies that may or may not demonstrate a real association are lacking.

Although there are many publications regarding Guillain-Barré syndrome and its possible relationship with COVID19, however, we can observe the lack of strong sources of evidence. Moreover, when we come across structured epidemiological studies such as the one carried out by Keddie et al., we can see how this association is at least doubtful.

In the theoretical field, the hypothesis seemed consistent that SARS-COV2, as occurs with other respiratory viruses, and also as hypothesized in relation to other coronaviruses in the past(37–38), could trigger the appearance of a syndrome of Guillain-Barré, however, establishing evidence in this regard is an arduous task, especially taking into account the overflow of systems, the reorganization of medical services, and the high incidence of infections that a pandemic implies, with the consequent coincidence or co-occurrence of events. In addition, it is difficult to report possible specific adverse reactions due to the administration of a vaccine, when the entire population is vaccinated.

Although it may still be premature to rule out the association between the SARS-COV2 virus and the appearance of Guillain-Barré syndrome, however, it seems risky to assume this association as well. We have conflicting data at the present time, and, prudence in making judgments about it, will further aid scientific progress.

Without a doubt, it is important to carry out more systematic, epidemiological, prospective studies that assess cohorts with patients with different degrees of involvement secondary to the COVID19 infection, as well as healthy, unexposed cohorts. Only in this way will it be possible to provide high, solid and reliable evidence to help clinical practice in the near future. Also when making consistent recommendations to patients.

There are still many questions to be resolved regarding this intricate subject. The sources of evidence, even with a large volume of publications, are still poor. With the current data, an association between COVID-19 infection and Guillain-Barré syndrome cannot be assumed, nor between vaccination against SARS-COV2 and Guillain-Barré syndrome; In both cases, however, if cause-effect existed, the pathophysiological mechanism would be the same, by means of cross-immunity due to the similarity between a sequence of the antigenic proteins of the virus and the gangliosides or other regions of the peripheral nerve(39- 40). It is striking, however, at the observational level that we are not facing a Guillain-Barré syndrome pandemic as would be expected if it were a strong association, either secondary to an infection as prevalent as COVID19, or secondary to a vaccination that in some countries borders on proportions close to 100%.

When faced with a patient who doubts whether or not to be vaccinated, or with a patient who has already suffered from Guillain-Barré syndrome secondary to vaccination, even recurrently(41), there are no great recommendations based on the evidence that we currently have, except perhaps that there is no compelling reason, in relation to Guillain-Barré syndrome, not to be vaccinated.

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No competing interests reported.

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Guillain-Barré syndrome and SARS-COV2 coronavirus. Vaccinate or get infected with COVID? What poses less risk?

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Abstract

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1. Introduction

2. Objectives

3. Material and methods

4. Results

5. Discussion

6. Conclusion

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