First case of postmortem study in a patient vaccinated against SARS-CoV-2
- We report on a patient with a single dose of vaccine against SARS-CoV-2.
- He developed relevant serum titer levels but died 4 weeks later.
- By postmortem molecular mapping, we found viral RNA in nearly all organs examined.
- However, we did not observe any characteristic morphological features of COVID-19.
- Immunogenicity might be elicited, while sterile immunity was not established.
We report on an 86-year-old male resident of a retirement home who received vaccine against SARS-CoV-2. Past medical history included systemic arterial hypertension, chronic venous insufficiency, dementia and prostate carcinoma. On January 9, 2021, the man received lipid nanoparticle-formulated, nucleoside-modified RNA vaccine BNT162b2 in a 30 mg dose. On that day and in the following 2 weeks, he presented with no clinical symptoms (Table 1). On day 18, he was admitted to hospital for worsening diarrhea. Since he did not present with any clinical signs of COVID-19, isolation in a specific setting did not occur. Laboratory testing revealed hypochromic anemia and increased creatinine serum levels. Antigen test and polymerase chain reaction (PCR) for SARS-CoV-2 were negative.
Gastroscopy and colonoscopy were performed to investigate the cause of diarrhea further. Colonoscopy, in particular, demonstrated an ulcerative lesion of the left colonic flexure, which was histologically diagnosed as ischemic colitis. PCR-analysis on biopsy specimens, following a previously reported method (Kaltschmidt et al., 2021), was negative for SARS-CoV-2. Treatment was supportive with mesalazine and intravenous iron substitution. Subsequently, the patient’s condition deteriorated under the development of renal insufficiency. On day 24, a patient in the same hospital room as our case tested positive for SARS-CoV-2. On day 25, our patient tested SARS-CoV-2 positive by real-time PCR (RT-PCR), with a low cycle threshold (Ct) value indicating high virus load. On further analysis of the swab sample, there was no evidence for mutant SARS-CoV-2 variants B.1.1.7, B.1.351 or B.22.214.171.124. Taken together, it appears the patient became infected from the patient in his hospital room. Our patient now presented with fever and respiratory discomfort, and lung auscultation displayed crackles. Despite starting supplemental oxygen (2 l per minute) and antibiotic therapy by ceftriaxone, the patient died from acute renal and respiratory failure on the following day.
Immunogenicity assessment by measuring spike protein (S1) antigen-binding immunoglobulin (Ig) G in the serum samples obtained at day 25 showed antibody response (8.7 U/ml, reference value <0.8–1.2 U/ml; Roche ECLIATM), while (nucleocapsid) NCP-IgG/IgM was not elicited (<0.1 U/ml, reference value >1.0 U/ml; Roche ECLIATM). These results indicate that the patient had already developed relevant immunogenicity through vaccination.
Postmortem study revealed acute bilateral bronchopneumonia with abscesses, sometimes being surrounded by bacterial cocci (Figure 1). There were no findings of commonly described manifestations of COVID-19-associated pneumonitis. In the heart, we found biventricular hypertrophy (weight 580 g) and histologically, we diagnosed ischemic cardiomyopathy. We detected amyloidosis of the transthyretin type in the heart and to a lesser extent in the lungs. The kidneys revealed both chronic damage with arteriolosclerosis and interstitial fibrosis, and acute renal failure with hydropic tubular degeneration. The examination of the brain revealed a left parietal pseudocystic tissue necrosis, which was diagnosed as an old infarction area.
We conducted molecular mapping of 9 different anatomical parts of formalin-fixed paraffin-embedded tissue as previously described (Kaltschmidt et al., 2021). RNA was extracted from paraffin sections using the Maxwell RSC (Promega, Madison, WI, USA). Multiplex RT-PCR analysis targeted 2 independent genes of the SARS-CoV-2-genome (Fluorotype SARS-CoV-2 plus Kit; HAIN/ Bruker, Nehren, Germany): RNA-dependent RNA polymerase (Target 1) and nucleopeptide (Target 2). The negative cut-off value was Ct >45. We examined 9 different tissue samples for known and relevant pathways of virus spreading in the human body (Figure 1). To prevent cross-contamination, each specimen was directly embedded in separate tissue cassettes and separately fixed in 4% phosphate-buffered saline-buffered formalin. We demonstrat- ed viral RNA in nearly all organs examined except for the liver and the olfactory bulb (Figure 1).
A detailed autopsy study including molecular virus mapping of a patient vaccinated against SARS-CoV-2 with a positive SARS-CoV-2 test post-vaccination has not previously been reported, to the authors’ knowledge. We suggest that a single treatment with BNT162b2 RNA vaccine elicited significant immunogenicity, as reflected in the reported spike proteinbased neutralizing IgG serum values. From the weeks before vaccination, through vaccination (day 1), to shortly before death (day 24), the patient was free of any clinical symptoms typically ascribed to COVID-19. Furthermore, blood work did not show an IgM titer that is generally observed 7–14 days after symptom onset (Kim et al., 2020). However, the patient tested SARS-CoV-2 positive. Both the Ct value measured in nasopharyngeal swab and values measured in formalin-fixed paraffin- embedded autopsy specimens indicate viral load and suggest transmissibility. Because our patient died approximately 2 days after his first positive SARS-CoV-2 test result, we suppose that the molecular mapping data reflects an early stage of viral infection. An early stage of infection might also explain why different regions such as the olfactory bulb and liver were not (yet) affected by systemic viral spread.
We did not observe any characteristic morphological features of COVID-19 reported in comprehensive morphological autopsy studies so far (Schaller et al., 2020; Edler et al., 2020; Ackermann et al., 2020). We did not find any typical signs of diffuse alveolar damage in the lungs, but we identified extensive acute bronchopneumonia, possibly of bacterial origin. We concluded that the patient died from bronchopneumonia and acute renal failure.
Our findings are in line with previous evidence from animal models that immunization against SARS-CoV-2 by vaccination appeared to reduce the severity of pathogenesis, especially with regard to severe lung disease, while viral RNA persisted in nasal swabs (Van Doremalen et al., 2020; Vogel et al., 2021). Recently, Amit et al. (2021) published results on a clinical trial on healthcare workers using vaccine BNT162b2 that demonstrated substantial early reductions in SARS-CoV-2 infection and symptomatic COVID-19 rates following administration of the first vaccine dose.
Concerning major adverse effects in patients receiving vaccination against SARS-CoV-2, local effects predominate, and severe systemic reactions are rarely described (Yuan et al., 2020). However, recent reports of an increased risk of blood clots, particularly of cerebral venous sinus thrombosis in the case of the Oxford-AstraZeneca vaccine (Mahase 2021), raised a matter of debate on the safety of COVID-19 vaccine in general. Comprehensive analysis of autopsy data must be performed to provide more detailed insights into lethal adverse effects and any deaths associated with vaccination.
In summary, the results of our autopsy case study in a patient with mRNA vaccine confirm the view that by first dose of vaccination against SARS-CoV-2 immunogenicity can already be induced, while sterile immunity is not adequately developed
Conflicts of interest
The authors do not have any commercial or financial conflict of interest.
This case study was performed in the setting of the German national “Defeat Pandemics” project, approved by the Medical Association of Westphalia-Lippe, Münster, Germany (Ref. 2020- 575-b-S) and carried out in accordance with the ethical principles of the Helsinki Declaration. Informed consent by the next-of-kin was available.
There was no funding received from any individual or organization.