“`html<\/p>\n
2025 y\u0131l\u0131n\u0131n ortalar\u0131nda COVID-19, vir\u00fcs\u00fcn s\u00fcrekli evrimi ve n\u00fcfuslar aras\u0131nda e\u015fitsiz ba\u011f\u0131\u015f\u0131kl\u0131kla karakterize edilen endemik bir a\u015famaya girdi. SARS-CoV-2, \u00f6zellikle spike proteini d\u00fczeyinde mutasyona devam ediyor; bu protein, vir\u00fcs\u00fcn insan h\u00fccrelerine daha iyi ba\u011flanmas\u0131n\u0131 ve ba\u011f\u0131\u015f\u0131kl\u0131k savunmalar\u0131ndan ka\u00e7mas\u0131n\u0131 sa\u011fl\u0131yor. Bu uyum yetene\u011fi, NB.1.8.1, LP.8.1 ve XFG gibi varyantlar\u0131n ortaya \u00e7\u0131kmas\u0131na yol a\u00e7t\u0131; bu varyantlar, artan bula\u015f\u0131c\u0131l\u0131klar\u0131 ve mevcut antikorlara diren\u00e7leri nedeniyle h\u0131zla yay\u0131l\u0131yor.<\/p>\n
2024 sonu ile 2025 ortas\u0131 aras\u0131nda epidemiyolojik veriler, vaka say\u0131lar\u0131nda \u00f6nemli dalgalanmalar g\u00f6steriyor; b\u00f6lgesel hastane yat\u0131\u015flar\u0131nda art\u0131\u015flar ve pozitif test say\u0131s\u0131nda y\u00fckseli\u015fler g\u00f6zlemleniyor. \u00d6rne\u011fin, test pozitifli\u011fi oran\u0131 \u015eubat ile May\u0131s 2025 aras\u0131nda %2\u2019den %11\u2019e y\u00fckseldi; bu seviye, 2024 yaz\u0131ndan beri g\u00f6r\u00fclmemi\u015fti. Amerika, Avrupa ve G\u00fcneydo\u011fu Asya, n\u00fcfus ba\u011f\u0131\u015f\u0131kl\u0131\u011f\u0131nda, varyant dola\u015f\u0131m\u0131nda ve g\u00f6zetim kapasitelerindeki farkl\u0131l\u0131klar\u0131 yans\u0131tan en belirgin art\u0131\u015flar\u0131 ya\u015fad\u0131.<\/p>\n
Bu d\u00f6nemde bask\u0131n varyantlar h\u0131zla de\u011fi\u015fti. Ocak 2025\u2019te XEC ve LP.8.1, izlenen su\u015flar\u0131n yakla\u015f\u0131k %50\u2019sini olu\u015ftururken, JN.1 ve KP.3.1.1 geriledi. Mart ay\u0131na gelindi\u011finde LP.8.1 bask\u0131n hale geldi, ard\u0131ndan Haziran\u2019da NB.1.8.1 ve XFG taraf\u0131ndan geride b\u0131rak\u0131ld\u0131; bu iki varyant da %30\u2019un \u00fczerinde payla her biriyle hakim duruma geldi. Bu varyantlar, spike proteininde F456L veya Q493E gibi kilit mutasyonlar payla\u015f\u0131yor; bu mutasyonlar, n\u00f6tralize edici antikorlardan ka\u00e7ma kabiliyetlerini art\u0131r\u0131yor. \u00d6rne\u011fin XFG, hem ba\u011f\u0131\u015f\u0131kl\u0131k ka\u00e7\u0131\u015f\u0131n\u0131 hem de vir\u00fcs stabilitesini g\u00fc\u00e7lendiren de\u011fi\u015fiklikler birle\u015ftirdi\u011fi i\u00e7in k\u00fcresel \u00f6l\u00e7ekte h\u0131zla yay\u0131l\u0131yor.<\/p>\n
A\u015f\u0131lar, hastal\u0131\u011f\u0131n \u015fiddetini s\u0131n\u0131rlamak i\u00e7in temel bir ara\u00e7 olmaya devam ediyor. JN.1 ve KP.2 varyantlar\u0131na uyarlanm\u0131\u015f mRNA a\u015f\u0131lar\u0131, 2025 y\u0131l\u0131nda dola\u015f\u0131mda olan su\u015flara kar\u015f\u0131 g\u00fc\u00e7l\u00fc n\u00f6tralize edici yan\u0131t g\u00f6steriyor. Bununla birlikte, etkinlikleri zamanla azal\u0131yor, \u00f6zellikle ya\u015fl\u0131 ki\u015filerde. Viral vekt\u00f6r veya protein alt birim a\u015f\u0131lar\u0131, ba\u015flang\u0131\u00e7ta daha az etkili olsalar da, T lenfositleri arac\u0131l\u0131\u011f\u0131yla sa\u011flam bir h\u00fccresel yan\u0131t sayesinde uzun s\u00fcreli koruma sa\u011fl\u0131yor. Bu h\u00fccreler, do\u011frudan enfekte h\u00fccreleri hedef alarak uzun vadeli ba\u011f\u0131\u015f\u0131kl\u0131k belle\u011finde kilit rol oynuyor.<\/p>\n
Farkl\u0131 teknolojileri birle\u015ftiren hat\u0131rlatma a\u015f\u0131lar\u0131 stratejileri, geni\u015f ve kal\u0131c\u0131 bir ba\u011f\u0131\u015f\u0131kl\u0131k sa\u011flamak i\u00e7in etkili oldu\u011fu ortaya \u00e7\u0131k\u0131yor. \u00d6rne\u011fin, viral vekt\u00f6rle yap\u0131lan ilk a\u015f\u0131lamadan sonra mRNA hat\u0131rlatma dozu, antikor ve T h\u00fccre yan\u0131tlar\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde iyile\u015ftirerek ba\u011f\u0131\u015f\u0131kl\u0131k tepkisini g\u00fc\u00e7lendiriyor. Bu sayede, mevcut savunmalardan ka\u00e7ma kabiliyetleri s\u00fcrekli artan yeni varyantlara kar\u015f\u0131 daha iyi diren\u00e7 g\u00f6sterilebiliyor.<\/p>\n
17 milyondan fazla dizinin payla\u015f\u0131ld\u0131\u011f\u0131 k\u00fcresel genomik g\u00f6zetim, bu evrimleri izlemeye ve sa\u011fl\u0131k yan\u0131tlar\u0131n\u0131 uyarlamaya olanak sa\u011flad\u0131. Bununla birlikte, sa\u011fl\u0131k hizmetlerine ve a\u015f\u0131lar\u0131na eri\u015fimdeki b\u00f6lgesel e\u015fitsizlikler ile ba\u011f\u0131\u015f\u0131kl\u0131\u011f\u0131n kademeli olarak azalmas\u0131, sa\u011fl\u0131k altyap\u0131lar\u0131n\u0131n g\u00fc\u00e7lendirilmesi ve yeni nesil a\u015f\u0131lar\u0131n geli\u015ftirilmesi ihtiyac\u0131n\u0131 vurguluyor. Bu yeni a\u015f\u0131lar, daha geni\u015f ve kal\u0131c\u0131 bir koruma sa\u011flamak i\u00e7in birden fazla antijeni hedef almal\u0131 ve \u00e7e\u015fitli varyantlar\u0131 n\u00f6tralize edebilecek T lenfosit yan\u0131t\u0131n\u0131 uyararak ba\u011f\u0131\u015f\u0131kl\u0131\u011f\u0131 art\u0131rmal\u0131.<\/p>\n
Son g\u00f6zlemler, vir\u00fcs\u00fcn ba\u011f\u0131\u015f\u0131kl\u0131k ka\u00e7\u0131\u015f mekanizmalar\u0131n\u0131 s\u00fcrekli olarak optimize etti\u011fini, mevcut a\u015f\u0131lar\u0131n ise iyile\u015ftirilmi\u015f olsalar bile uzun vadede tam bir koruma sa\u011flamakta zorland\u0131\u011f\u0131n\u0131 do\u011fruluyor. Bu fakt\u00f6rlerin birle\u015fimi, gelecekteki dalgalar\u0131 \u00f6ng\u00f6rmek ve hastal\u0131\u011f\u0131n etkisini s\u0131n\u0131rlamak i\u00e7in bilimsel yenilik ve uluslararas\u0131 i\u015f birli\u011fini birle\u015ftiren k\u00fcresel bir yakla\u015f\u0131m\u0131 zorunlu k\u0131l\u0131yor.<\/p>\n
“`<\/p>\n
DOI\u00a0:<\/strong> https:\/\/doi.org\/10.1186\/s12982-026-01657-z<\/a><\/p>\n Titre\u00a0:<\/strong> SARS-CoV-2 variant dynamics and COVID-19 vaccine effectiveness during global epidemiological changes in mid-2025<\/p>\n Revue : <\/strong> Discover Public Health<\/p>\n \u00c9diteur : <\/strong> Springer Science and Business Media LLC<\/p>\n Auteurs : <\/strong> Risha Haldar; Prolay Halder; Bhaskar Mahanayak<\/p>\n","protected":false},"excerpt":{"rendered":" “`html COVID-19 vir\u00fcs\u00fc evrim ge\u00e7iriyor ve a\u015f\u0131lar 2025’te uyum sa\u011fl\u0131yor 2025 y\u0131l\u0131n\u0131n ortalar\u0131nda COVID-19, vir\u00fcs\u00fcn s\u00fcrekli evrimi ve n\u00fcfuslar aras\u0131nda e\u015fitsiz ba\u011f\u0131\u015f\u0131kl\u0131kla karakterize edilen endemik bir a\u015famaya girdi. SARS-CoV-2, \u00f6zellikle spike proteini d\u00fczeyinde mutasyona devam ediyor; bu protein, vir\u00fcs\u00fcn insan h\u00fccrelerine daha iyi ba\u011flanmas\u0131n\u0131 ve ba\u011f\u0131\u015f\u0131kl\u0131k savunmalar\u0131ndan ka\u00e7mas\u0131n\u0131 sa\u011fl\u0131yor. Bu uyum yetene\u011fi, NB.1.8.1, LP.8.1 ve… Okumaya devam et COVID-19 vir\u00fcs\u00fc evrim ge\u00e7iriyor ve a\u015f\u0131lar 2025’te uyum sa\u011fl\u0131yor<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,4],"tags":[],"class_list":["post-21","post","type-post","status-publish","format-standard","hentry","category-bilim-teknoloji","category-saglik","entry"],"_links":{"self":[{"href":"https:\/\/theinternationaljournal.media\/tr\/wp-json\/wp\/v2\/posts\/21","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/theinternationaljournal.media\/tr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/theinternationaljournal.media\/tr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/theinternationaljournal.media\/tr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/theinternationaljournal.media\/tr\/wp-json\/wp\/v2\/comments?post=21"}],"version-history":[{"count":1,"href":"https:\/\/theinternationaljournal.media\/tr\/wp-json\/wp\/v2\/posts\/21\/revisions"}],"predecessor-version":[{"id":22,"href":"https:\/\/theinternationaljournal.media\/tr\/wp-json\/wp\/v2\/posts\/21\/revisions\/22"}],"wp:attachment":[{"href":"https:\/\/theinternationaljournal.media\/tr\/wp-json\/wp\/v2\/media?parent=21"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/theinternationaljournal.media\/tr\/wp-json\/wp\/v2\/categories?post=21"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/theinternationaljournal.media\/tr\/wp-json\/wp\/v2\/tags?post=21"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}