Core Viewpoint - The article discusses the long-standing public health issue of why certain mosquito species can transmit specific viruses while others cannot, emphasizing the need for a deeper understanding of the biological mechanisms behind mosquito-virus interactions [4][5]. Group 1: Mosquito Species and Virus Transmission - There are over 3,500 known mosquito species, but fewer than 100 can transmit severe human infectious diseases such as dengue, Zika, and malaria [2]. - The main mosquito vectors are categorized into three types: Aedes, Culex, and Anopheles, with Aedes being the primary vector for tropical diseases [2][4]. - Culex mosquitoes are widespread in temperate regions but are ineffective in transmitting tropical viruses like dengue and Zika, limiting the spread of these diseases to tropical and subtropical areas [4]. Group 2: Scientific Questions and Research Findings - Two fundamental scientific questions remain: the biological basis of mosquito-virus interactions and the reasons behind the species-specific transmission of different viruses by various mosquito species [5]. - A study published in Nature by a team from Tsinghua University identified that the acidic environment of the blood lymph in certain mosquitoes allows for the specific interaction between the virus and mosquito proteins, leading to the formation of infectious extracellular vesicles [7][12]. - The research revealed that the interaction between mosquito VCP proteins and viral capsid proteins is crucial for determining the specificity of virus infection in mosquitoes, highlighting the importance of molecular compatibility in virus transmission [10][12].

Core Insights - The European Centre for Disease Prevention and Control (ECDC) reported a record high of local transmission events of Chikungunya virus in Europe this year, with 27 cases reported as of August 13 [1][2] - The number of West Nile virus infections in Europe has reached its highest level in three years, with 335 reported cases and 19 deaths across eight countries [1][2] - Climate change is identified as a significant factor contributing to the increased spread of mosquito-borne diseases, leading to a longer transmission season and broader geographic range [4][5] Summary by Category Chikungunya Virus - A total of 27 local transmission events of Chikungunya virus have been recorded in Europe this year, marking a new high [1] - France reported 111 cases, while Italy reported 7 cases, with no deaths recorded [1] West Nile Virus - The ECDC noted that the number of West Nile virus infections is the highest in three years, with 335 cases reported and 19 deaths [1][2] - Italy has the most severe situation with 274 reported cases [1] Geographic Spread and Climate Impact - The range of the Asian tiger mosquito, which transmits Chikungunya virus, has expanded from 114 areas a decade ago to 369 areas currently [2] - The ECDC highlighted that the transmission risk is spreading to more northern regions, as evidenced by the first reported local case in Alsace, France [2] - Climate and environmental factors, such as rising temperatures and changing rainfall patterns, are driving the increased intensity and duration of mosquito-borne disease transmission [4][5] Public Health Implications - ECDC officials warn that the evolving patterns of mosquito-borne diseases will pose greater risks to the population in Europe [5] - Coordinated public health actions and personal protective measures are emphasized as increasingly important [5]