2020
DOI: 10.1016/j.ijid.2020.05.070
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A case of transient existence of SARS-CoV-2 RNA in the respiratory tract with the absence of anti-SARS-CoV-2 antibody response

Abstract: We report the case of a patient who had travelled to Japan and who presented mild respiratory symptoms during the COVID-19 outbreak period. There was transient existence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) RNA in his oropharynx. The RNA was absent in the six respiratory specimens that were subsequently tested. An anti-SARS-CoV-2 antibody response was absent in the acute and convalescent sera. The reported case indicates that transient colonization of SARS-CoV-2 in the upper respirat… Show more

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Cited by 16 publications
(17 citation statements)
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“…Because this woman had no known immunosuppressive disease and was not under immunosuppressive medication, transient SARS-CoV-2 existence without induction of a measurable antibody response is a plausible explanation for the negative test results. Similar observations have been reported in the recent literature [ 32 ]. Therefore, our study demonstrates the effect of individual variations in immunological responses to infection on the performance of serological tests.…”
Section: Discussionsupporting
confidence: 92%
See 1 more Smart Citation
“…Because this woman had no known immunosuppressive disease and was not under immunosuppressive medication, transient SARS-CoV-2 existence without induction of a measurable antibody response is a plausible explanation for the negative test results. Similar observations have been reported in the recent literature [ 32 ]. Therefore, our study demonstrates the effect of individual variations in immunological responses to infection on the performance of serological tests.…”
Section: Discussionsupporting
confidence: 92%
“…To date, Taiwan has gone >100 days without reporting a single case of local transmission of COVID-19 [ 23 ]. Therefore, if a CLIA method (either Roche Test or Abbott Test) was applied for seroprevalence study for mass surveillance or among different risk populations in countries with a low prevalence of COVID-19 like Taiwan, further tests, including LFIAs, evaluation of the presence of anti-CMV antibodies or autoantibodies, the western blotting method, and even qRT-PCR assays for respiratory secretions of enrolled participants with positive results on CLIAs, are needed to confirm or exclude the presence of SARS-CoV-2 RNA or anti-SARS-CoV-2 antibodies [ 32 , 36 , 37 ].…”
Section: Discussionmentioning
confidence: 99%
“…Regarding the protective immunity, Alonso, et al hypothesized the first mild viral infection might not strong enough to establish a detectable humoral response [ 65 ]. It was also possible for the absence of IgM and IgG antibodies, which were capable of connecting to the virus and preventing it from entering the host cell [ 66 ], in the acute and convalescent serum of the reinfected patients [ 67 ]. Although neutralizing antibodies and memory B and T cells again some common human coronaviruses (HCoV) such as HCoV-229E and HCoV-OC43 were also suggested to confer cross-immunity against SARS-CoV-2 [ 68 ], a report based on data on 150 patients showed that the presence of serum IgM and IgG was not significantly associated with a lower rate of disease recurrence (OR = 0.92, 95% CI = 0.27–3.16) [ 69 ].…”
Section: Discussionmentioning
confidence: 99%
“…Our patient, on the other hand, presented a more potent form of COVID-19 after more than 40 days from the rst mild infection, and with a detectable antibody response only after the second infectious episode. Our hypothesis is that the rst mild infection was not su cient to build up a detectable humoral response [8], which occurred only after 14 days of a second more severe episode. In addition, the absence of detectable antibodies in the rst episode may have allowed for a new infection, rather than a recurrence.…”
Section: Discussionmentioning
confidence: 97%
“…On the other hand, a re-infection with a new or maybe the same circulating strain is not unfeasible [3], given the different pro les of immune response to the virus [7]. In fact, the detection of SARS-Cov-2 RNA with the absence of anti-SARS-CoV-2 antibody response has been previously observed [8].…”
Section: Discussionmentioning
confidence: 99%