Şiddetli akut solunum sendromu koronavirüs-2'nin (severe acute respiratory syndrome coronavirus-2; SARS-CoV-2) etiyolojik etkeni olduğu koronavirüs hastalığı 2019 (coronavirus disease 2019; COVID-19) pandemisi, mevcut ve olası sonuçları açısından tüm dünyayı etkisi altına almıştır. COVID-19 oldukça özgün virolojik, klinik ve immünolojik karakteristik özelliklere sahiptir. COVID-19 tanılı hastalarda SARS-CoV-2'ye karşı antikor yanıtlarının karakterize edilmesi ve tanımlanması, salgının dinamiklerinin anlaşılması ve daha etkin mücadele stratejilerinin geliştirmesi için kritik önem taşımaktadır. SARSCoV-2'ye karşı humoral immün yanıtlara ilişkin bazı belirsizlikler mevcuttur. Bunlardan ilki SARS-CoV-2 enfeksiyonuna karşı oluşan B hücre bellek yanıtlarının süresi ile ilgilidir. Bir virüse yönelik uygun B hücre yanıtlarının, reenfeksiyonlara karşı koruyucu olması beklenir. Buna karşın mevcut veriler, COVID-19 enfeksiyonu sonrası antikor aracılı bağışıklığın, reenfeksiyona karşı koruyucu etkinliğinin sınırlı olduğuna işaret etmektedir. Bir diğer sorun ise serokonversiyonu belirlemek ve antikor yanıtlarını ölçmek amacıyla kullanılan serolojik deneylerin özgüllüğü ve validasyonu ile ilişkilidir. COVID-19'da hastaların bir kısmında antikor yanıtlarının zayıf olması ve diğer CoV'ler ile ilişkili çapraz reaktivitenin varlığı, serolojik deneylerin güvenirliliğini sınırlandırabilmektedir. Bu nedenle anti-SARS-CoV-2 antikorlarının kinetiği, antikor ilişkili immünitenin etkinliği ve immünopatogenezinin anlaşılması ile spesifik ve valide serolojik testlerin geliştirilmesi hususunda yoğun bir araştırma çabası mevcuttur. Bu derlemede anti-SARSCoV-2 antikorlarının kinetiği, antikor aracılı immünitenin etkinliği ve serolojik tanıya yönelik gelişmelerin irdelenmesi amaçlamıştır.
Anahtar Kelimeler: SARS-CoV-2; COVID-19; antikor yanıtları; B hücre bellek yanıtları; reenfeksiyon; nötralzan antikorlar; serolojik deneyler; bağışıklık belgesi
Coronavirus disease-2019 (COVID-19) pandemic which is the etiological agent of severe acute respiratory syndrome-associated a coronavirus (SARS-CoV-2) has influenced the whole world with the current and possible results. COVID-19 has very unique characteristic of virological, clinical and immunological. Characterization and identification of antibody responses against SARS-CoV-2 in patients with COVID-19 is critical for understanding the dynamics of the outbreak and to developed more effective interventions strategies. Some of gaps about humoral immune responses to SARS-CoV-2. The first of these is about life-span of B cell memory responses to SARS-CoV-2 infection. It is expected that eligible B cell response to a virus prevents reinfection. However, current evidence is pointed that effectiveness of prevent against reinfection to antibody-mediated immunity after COVID-19 infection is limited. Second else challenge is about to specificity and validation of serological assay used to determine seroconversion and measure antibody responses. In COVID-19, weak antibody responses in some patients and the presence of cross-reactivity associated with other CoVs may limit the reliability of serological experiments. Therefore, there is an intense research effort to reveal kinetics, effectiveness of antibody-mediated immunity and immunopathogenesis of antiSARS-CoV-2 antibodies with to develop specific and validated serological tests. In this review, it is aimed to examination about kinetics of anti-SARS-CoV-2 antibodies, effectiveness of antibody-mediated immunity with also advances in serological diagnosis.
Keywords: SARS-CoV-2; COVID-19; antibody responses; B cell memory responses; reinfection; neutralizing antibodies; serological assays; immunity passports
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