カナダの2010年第44週10月31日ー11月06日の風邪(インフルエンザ)感染状況

カナダの2010年第44週10月31日ー11月06日の風邪(インフルエンザ)感染状況
Public Health Agency of Canada http://www.phc-aspc.gc.ca
Flu Watch : http://www.phac-aspc.gc.ca/fluwatch/index-eng.php
>> Current weekly Report
Flu Watch
October 31 to November 6, 2010 (Week 44)
Posted 2010-11-12

2010年11月17日水曜日16:52(JST:00:52) 曇り 最低気温;08ºC 最高気温;14ºC BARCELONA県から
カナダの2010年第44週10/31-11/06の風邪インフルエンザ感染伝染状況は低い。44週10/31-11/06の風邪症状の診断率は、
11'7件/1000人の患者で、前回より減少した。風邪症状診断率の高いのは、成人の20歳から64歳までの年齢層で、13'6件/1000人の患者で、次に、5歳から19歳までで風邪診察率は、11'6件/1000人の患者だった。
第44週10/31-11/06の間に検査された1784件(1'784)のうち、1'23%の22件が インフルエンザ陽性反応して、そのうち、12件は インフルエンザA(H3N2)で、10件は インフルエンザA型未分類(未確認)だった。44週に検出されたヴィールスのうち、パラインフルエンザは 3'1%で、アデノヴィールスは、2'5%で、RESPIRATORY BSYNCYTIAL VIRUS (RSV)は、
2'0%で、HUMAN MATAPNUEUMOVIRUS は、0'2%だった。インフルエンザ流行期が始まってから、リノビールスの検出は高く、44週10/31ー11/06では、22'0%と高い。
65件の詳しいインフルエンザ陽性反応の検体試料の情報の報告によると、52件は、インフルエンザA(H3N2)で、10件は、未確認で、2件は 新型インフルエンザで、1件は インフルエンザB型だった。10件の詳細な情報のインフルエンザA(H3N2)のうち、70%の7件は、45歳以下の患者だった。しかし、08月29日以来52件のインフルエンザA(H3N2)うち、50%の26件は65歳以上の患者だった。
08月29日から11月06日までの合計では、すべてのインフルエンザヴィールスの107件のうち、インフルエンザB型は、3件で、インフルエンザA型は、104件で、そのうち、インフルエンザA(H3N2)は、42件で、新型インフルエンザは、2件で、インフルエンザA型未分類(未確認)は、60件だッた。
44週10/31ー11/06では、1件の18歳以下の未成年のインフルエンザ感染確認の入院患者がでて、その患者は6カ月以上23カ月以下で、インフルエンザA(H3N2)だった。風邪流行期が始まってから2人の2歳以下の未成年の患者の入院者がでて、2人ともインフルエンザA(H3N2)だった。
44週10/31ー11/06では、16歳以上の成年の入院患者は出ておらず、風邪流行期が始まってから、11人の成人の入院患者が報告されて、そのうち、2件はインフルエンザA(H3N2)で、1件は 新型インフルエンザで、8件は インフルエンザA型未確認だった。11件のうち、8件は65歳以上の入院患者で、7件は 男性の入院患者だった。

International influenza update

Global information

WHO: Worldwide, overall influenza activity remained low, except in parts of the tropics, most notably in Southeast Asia, and to a lesser extent in the tropical areas of the Americas. After late winter and springtime influenza epidemics in several countries of the temperate Southern Hemisphere, influenza activity has returned to near or below baseline in most places. However, a recent post-season rise in cases has been noted across parts of southern Africa associated with localized outbreaks of pandemic H1N1 2009. Seasonal influenza A/H3N2 viruses continued to be the predominant circulating strain of influenza viruses worldwide, however, in many countries there has been co-circulation of seasonal influenza B viruses and to a lesser extent, pandemic H1N1 2009. The latter has been recently predominant in a limited
number of countries, including in India.
<http://www.who.int/csr/disease/influenza/2010_11_08_GIP_surveillance/en/index.html>

Geographic update

Northern hemisphere

United States: During week 44, influenza activity remained low in the United States. The geographic spread of influenza in the U.S. Virgin Islands was assessed as regional; Guam and one state reported local influenza activity; the District of Columbia, Porto Rico and 28 states were assessed as sporadic; and 21 states reported no influenza activity. 25 (1.4%) specimens were tested positive for influenza this week. The proportion of outpatient visits for influenza-like illness (ILI) and the proportion of deaths attributed to pneumonia and influenza (P&I) were both below the national baseline. One influenza-associated pediatric death was reported. This death was associated with an influenza A virus for which the subtype was undetermined and occurred during the 2009-10 season. <http://www.cdc.gov/flu/weekly/index.htm>
Latin America: In the tropics of the Americas, between late July and early October, many countries or parts of countries experienced periods of active circulation of influenza viruses, including but not limited to southern Mexico, Costa Rica, Nicaragua, El Salvador, Honduras, Jamaica, Cuba, Peru, Colombia, and Bolivia. In most of these countries, seasonal influenza A/H3N2 was the predominant circulating influenza virus. Notably, Nicaragua observed circulation of predominantly influenza B viruses, while Colombia and Bolivia experienced circulation of predominantly pandemic H1N1 2009. In most countries of the region, overall influenza virus transmission has declined substantially or returned to very low levels. <http://www.who.int/csr/disease/influenza/2010_11_08_GIP_surveillance/en/index.html>
Europe: Rare detections of influenza virus along with sporadic detections of respiratory syncytial virus in a number of European countries suggested that the low influenza-like illness and acute respiratory infection activity currently observed was likely due to respiratory pathogens other than influenza. The large majority of countries continued to report low rates and unchanging trends in sentinel physician consultations for influenza-like illness and acute respiratory infection. During week 43, nine (2.6%) of 344 sentinel specimens tested positive for influenza virus. Sixteen of 18 influenza viruses detected in sentinel and non-sentinel specimens were type A, and the other two were type B. Of the 10 subtyped, eight were pandemic H1N1 2009 and two were A/H3N2. One SARI case considered to be related to flu was reported during week 43.
<http://ecdc.europa.eu/en/publications/Publications/101105_SUR_Weekly_Influenza_Surveillance_Overview.pdf>
Asia: In the tropics of Asia, the most active reported circulation of influenza viruses continued to be in Thailand. Since late July 2010, pandemic H1N1 2009 has been the predominant circulating influenza viruses in Thailand, however, more recently beginning in early October 2010, seasonal influenza A/H3N2, B, and pandemic H1N1 2009 viruses began to co-circulate at similar levels. In southern China and Hong Kong (SAR), recent periods of active circulation of seasonal influenza A/H3N2 viruses during late summer and autumn appeared to have largely subsided. In India, the national epidemic of pandemic H1N1 2009 which began during June 2010 and lasted until late September 2010 has largely subsided but small numbers of new cases continued to reported weekly. In Bangladesh, there has been persistent influenza virus transmission since the early part of 2010, however; only in recent months has circulation of seasonal influenza A/H3N2 become predominant.
<http://www.who.int/csr/disease/influenza/2010_11_08_GIP_surveillance/en/index.html>

Southern hemisphere

South America: In Chile, an unusually late winter and springtime influenza epidemic, characterized by predominance of circulating seasonal influenza A/H3N2 viruses, and to a lesser extent seasonal influenza B and pandemic H1N1 2009, appears to have largely subsided. A similarly timed influenza epidemic was also observed in Paraguay and Uruguay. In Argentina, however, little winter and springtime influenza activity was observed during 2010, with influenza B viruses accounting for the majority of sporadic influenza virus detections.
<http://www.who.int/csr/disease/influenza/2010_11_08_GIP_surveillance/en/index.html>

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