Failure to demonstrate experimental vertical transmission of the epidemic strain of Chikungunya virus in Aedes albopictus from La Réunion Island, Indian Ocean. 2009

Marie Vazeille, and Laurence Mousson, and Anna-Bella Failloux
Génétique Moléculaire des Bunyavirus, Institut Pasteur, 75724 Paris Cedex 15, France. marie.vazeille@pasteur.fr

Aedes albopictus was responsible for transmission in the first outbreak of chikungunya (CHIK) on La Réunion Island, Indian Ocean, in 2005-2006. The magnitude of the outbreak on this island, which had been free of arboviral diseases for over 30 years, as well as the efficiency of Ae. albopictus as the main vector, raises questions about the maintenance of the CHIK virus (CHIKV) through vertical transmission mechanisms. Few specimens collected from the field as larvae were found to be infected. In this study, Ae. albopictus originating from La Réunion were orally infected with a blood-meal containing 10(8) pfu/mL of the CHIKV epidemic strain (CHIKV 06.21). Eggs from the first and second gonotrophic cycles were collected and raised to the adult stage. The infectious status of the progeny was checked (i) by immunofluorescence on head squashes of individual mosquitoes to detect the presence of viral particles or (ii) by quantitative RT-PCR on mosquito pools to detect viral RNA. We analysed a total of 1,675 specimens from the first gonotrophic cycle and 1,709 from the second gonotrophic cycle without detecting any viral particles or viral RNA. These laboratory results are compared to field records.

UI MeSH Term Description Entries
D007303 Insect Vectors Insects that transmit infective organisms from one host to another or from an inanimate reservoir to an animate host. Insect Vector,Vector, Insect,Vectors, Insect
D002646 Chikungunya virus A species of ALPHAVIRUS causing an acute dengue-like fever.
D005455 Fluorescent Antibody Technique Test for tissue antigen using either a direct method, by conjugation of antibody with fluorescent dye (FLUORESCENT ANTIBODY TECHNIQUE, DIRECT) or an indirect method, by formation of antigen-antibody complex which is then labeled with fluorescein-conjugated anti-immunoglobulin antibody (FLUORESCENT ANTIBODY TECHNIQUE, INDIRECT). The tissue is then examined by fluorescence microscopy. Antinuclear Antibody Test, Fluorescent,Coon's Technique,Fluorescent Antinuclear Antibody Test,Fluorescent Protein Tracing,Immunofluorescence Technique,Coon's Technic,Fluorescent Antibody Technic,Immunofluorescence,Immunofluorescence Technic,Antibody Technic, Fluorescent,Antibody Technics, Fluorescent,Antibody Technique, Fluorescent,Antibody Techniques, Fluorescent,Coon Technic,Coon Technique,Coons Technic,Coons Technique,Fluorescent Antibody Technics,Fluorescent Antibody Techniques,Fluorescent Protein Tracings,Immunofluorescence Technics,Immunofluorescence Techniques,Protein Tracing, Fluorescent,Protein Tracings, Fluorescent,Technic, Coon's,Technic, Fluorescent Antibody,Technic, Immunofluorescence,Technics, Fluorescent Antibody,Technics, Immunofluorescence,Technique, Coon's,Technique, Fluorescent Antibody,Technique, Immunofluorescence,Techniques, Fluorescent Antibody,Techniques, Immunofluorescence,Tracing, Fluorescent Protein,Tracings, Fluorescent Protein
D000330 Aedes A genus of mosquitoes (CULICIDAE) frequently found in tropical and subtropical regions. YELLOW FEVER and DENGUE are two of the diseases that can be transmitted by species of this genus. Aede
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D012367 RNA, Viral Ribonucleic acid that makes up the genetic material of viruses. Viral RNA
D018354 Alphavirus Infections Virus diseases caused by members of the ALPHAVIRUS genus of the family TOGAVIRIDAE. Getah Virus Infection,Sagiyama Virus Infection,Semliki Forest Virus Infection,Sindbis Fever,Sindbis Virus Infection,Alpha Virus Infections,Barmah Forest Virus Infection,Infections, Alphavirus,Mayaro Virus Infection,O'nyong-nyong Virus Infection,Alpha Virus Infection,Alphavirus Infection,Fever, Sindbis,Infection, Alphavirus,Infection, Getah Virus,Infection, Mayaro Virus,Infection, O'nyong-nyong Virus,Infection, Sagiyama Virus,Infection, Sindbis Virus,O'nyong nyong Virus Infection,O'nyong-nyong Virus Infections,Sindbis Fevers,Sindbis Virus Infections,Virus Infection, Alpha,Virus Infection, Getah,Virus Infection, Mayaro,Virus Infection, O'nyong-nyong,Virus Infection, Sagiyama,Virus Infection, Sindbis
D018445 Infectious Disease Transmission, Vertical The transmission of infectious disease or pathogens from one generation to another. It includes transmission in utero or intrapartum by exposure to blood and secretions, and postpartum exposure via breastfeeding. Fetomaternal Infection Transmission,Infection Transmission, Fetomaternal,Infection Transmission, Maternal-Fetal,Infection Transmission, Vertical,Maternal-Fetal Infection Transmission,Mother-to-Child Transmission,Pathogen Transmission, Vertical,Vertical Infection Transmission,Vertical Infectious Disease Transmission,Vertical Transmission of Infectious Disease,Infection Transmission, Maternal Fetal,Maternal Fetal Infection Transmission,Mother to Child Transmission,Mother-to-Child Transmissions,Transmission, Fetomaternal Infection,Transmission, Maternal-Fetal Infection,Transmission, Mother-to-Child,Transmission, Vertical Infection,Transmission, Vertical Pathogen,Transmissions, Mother-to-Child,Vertical Pathogen Transmission
D019156 Indian Ocean A body of water covering approximately one-fifth of the total ocean area of the earth, extending amidst Africa in the west, Australia in the east, Asia in the north, and Antarctica in the south. Including the Red Sea and the Persian Gulf, it constitutes the third largest ocean after the ATLANTIC OCEAN and the PACIFIC OCEAN. (New Encyclopaedia Britannica Micropaedia, 15th ed, 1990, p289) Persian Gulf,Red Sea
D020133 Reverse Transcriptase Polymerase Chain Reaction A variation of the PCR technique in which cDNA is made from RNA via reverse transcription. The resultant cDNA is then amplified using standard PCR protocols. Polymerase Chain Reaction, Reverse Transcriptase,Reverse Transcriptase PCR,PCR, Reverse Transcriptase,Transcriptase PCR, Reverse

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