Covid 19 Pandemisi Gölgesinde Kalan Zikavirüs ve Prenatal Enfeksiyöz Beyin Hasarı
Özet
TORCH (Toksoplazma gondii, Rubella, Sitomegalovirüs, Herpes Simpleks Virüsü) enfeksiyon ajanları grubuna son dönemde Zikavirüsün de (ZKV) eklenmesiyle oluşan "TORZİCH" kavramı, bu patojenlerin prenatal beyin hasarı ile mikrosefali üzerindeki etkilerini ortaya koymaktadır. Enfeksiyöz viral prenatal beyin hasarları genellikle intrakranial kalsifikasyonlar, mikrosefali, hidrosefali, işitme kaybı ve oküler lezyonlar şeklinde ortaya çıkmaktadır. Mikrosefali başlangıç zamanına göre primer (konjenital) ve sekonder olarak ikiye ayrılmakta; konjenital enfeksiyonlar fetal merkezi sinir sistemi hücrelerine olan nörotropizmleri nedeniyle her iki tipe de yol açabilmektedir. Sivrisinekler, cinsel ilişki ve transplasental yollarla bulaşan Zikavirüs, özellikle gebeliğin ilk trimesterindeki enfeksiyonlarda en yüksek fetal mikrosefali riskini taşımaktadır. Konjenital Zika Sendromu; kraniyofasiyal orantısızlık, spastisite, kaba kalsifikasyonlar, oküler hasar ve ciddi zihinsel gerilik ile karakterizedir. Patojenlerin plasenta bariyerini ve trofoblast savunmasını aşarak embriyonik beyindeki nöral progenitör hücreleri hedef alması, düzensiz nörogeneze, apoptoza ve nöron kayıplarına neden olmaktadır. Tedavisi ve aşısı bulunmayan ZKV ve CMV gibi virüslere karşı vektör kontrolü, kişisel hijyen ve seyahat kısıtlamaları hayati önem taşırken; Rubella ve suçiçeği gibi etkenlerde gebelik öncesi aşılama ön plana çıkmaktadır. Küresel yayılım potansiyeline karşı prenatal dönemde erken teşhis, tarama testleri ve toplum bilincinin artırılması kritik bir gerekliliktir.
The concept of "TORZİCH," formed by the recent addition of Zika virus (ZIKV) to the TORCH group of infectious agents (Toxoplasma gondii, Rubella, Cytomegalovirus, Herpes Simplex Virus), reveals the impact of these pathogens on prenatal brain damage and microcephaly. Infectious viral prenatal brain damage generally manifests as intracranial calcifications, microcephaly, hydrocephalus, hearing loss, and ocular lesions. Microcephaly is classified as primary (congenital) or secondary based on the time of onset, and congenital infections can lead to both types due to their neurotropism for fetal central nervous system cells. Zika virus, transmitted via mosquitoes, sexual contact, and transplacental routes, carries the highest risk of fetal microcephaly particularly during first-trimester infections. Congenital Zika Syndrome is characterized by craniofacial disproportion, spasticity, coarse calcifications, ocular damage, and severe mental retardation. The targeting of neural progenitor cells in the embryonic brain by pathogens overcoming the placental barrier and trophoblast defenses leads to unregulated neurogenesis, apoptosis, and neuronal loss. While vector control, personal hygiene, and travel restrictions are vital against viruses like ZIKV and CMV that lack effective treatments or vaccines, pre-pregnancy vaccination is paramount for agents such as Rubella and varicella. Early prenatal diagnosis, screening tests, and raising public awareness are critical requirements against the potential for global spread.
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