Senior onderzoeker Infectieziekten in de Eerste Lijn, surveillance
Publicatie
Publicatie datum
Annual report Surveillance of influenza and other respiratory infections in the Netherlands: winter 2017/2018.
Reukers, D.F.M., Asten, L. van, Brandsema, P.S., Dijkstra, F., Donker, G.A., Gageldonk-Lafeber, A.B. van, Hooiveld, M., Lange, M.M.A. de, Marbus, S.D., Teirlinck, A.C., Meijer, A., Hoek, W. van der. Annual report Surveillance of influenza and other respiratory infections in the Netherlands: winter 2017/2018. Bilthoven: National Institute for Public Health and the Environment, 2018. 144 p. p.
Influenza epidemic
The influenza epidemic of the 2018/2019 winter was mild and lasted 14 weeks. That is longer than the average period of nine weeks during the last 20 years, but it is shorter than the extended influenza epidemic of 2017/2018 which lasted 18 weeks. Between October 2018 and May 2019, a total of approximately 400,000 people became ill due to the influenza virus. Approximately 165,000 people consulted their general practitioner with influenza-like symptoms. Fewer people were admitted to the hospital as a result of influenza complications (mostly pneumonia). This number was estimated to be around 11,000, compared to 16,000 during the 2017/2018 flu season. Type A influenza virus was responsible for the majority of illnesses. There were 2,900 more deaths during the influenza epidemic than would normally be expected during this period.
Influenza vaccine effectiveness
During the 2018/2019 flu season, the influenza vaccine in the Netherlands reduced the risk of developing flu by 57%. This is about the same effect as in the previous flu seasons. In Europe, the vaccine was less effective against one of the most common circulating influenza viruses. An international study is being carried out to determine the reason for this. The effectiveness of the influenza vaccine can differ greatly from season to season. This is because the decision on the composition of the flu vaccine is made half a year beforehand. This is based on the viruses that were most common globally during the previous flu season. However, influenza viruses can change or other influenza viruses may dominate by the time the flu season breaks out in the Netherlands. This is why it is not possible to predict exactly which influenza viruses will circulate in the Netherlands in the next season.
Notifiable respiratory infections
Some respiratory infections have to be reported to the Public Health Services. They can then intensively monitor such infections and, if necessary, take timely action to prevent their further spread. The number of reports of legionella increased further in 2018 and reached 584, which is the highest number ever reported. The number of reports of tuberculosis (806), Q fever (18) and psittacosis (64) remained stable. Q fever, psittacosis and legionella generally manifest themselves in the form of pneumonia. The number of cases reported is an underestimation of the actual number. This is because tests are often not carried out for these illnesses if people have pneumonia.
PUBLIEKSSAMENVATTING
Griep
In de winter van 2017/2018 duurde de griepepidemie 18 weken. Dat is langer dan het gemiddelde van de afgelopen 20 jaar (negen weken). In totaal zijn tussen oktober 2017 en mei 2018 ongeveer 900.000 mensen ziek geworden door het griepvirus. Naar schatting bezochten 340.000 mensen de huisarts met griepachtige klachten. Daarnaast waren ziekenhuizen tijdelijk overbelast door de vele patiënten die vanwege complicaties van griep (meestal longontsteking) moesten worden opgenomen; naar schatting ruim 16.000. Ook zijn er tijdens de epidemie 9.500 meer mensen overleden dan gebruikelijk is in het griepseizoen (oktober tot mei). Tijdens de gehele epidemie zijn mensen vooral ziek geworden van het type B (Yamagata-lijn) griepvirus. Het is niet eerder voorgekomen dat een type B-griepvirus vanaf het begin van de epidemie overheerst
.
Effectiviteit griepvaccin
In het onderzochte seizoen heeft het vaccin bij 44 procent van de mensen die zich tegen de griep hebben laten vaccineren, voorkomen dat ze griepvirus B kregen. De Yamagata-lijn van griepvirus type B zat niet in het vaccin van het afgelopen seizoen. De redelijke bescherming die het vaccin bood komt doordat er wel een ander type B in zat. De lange duur van de griepepidemie kan dan ook niet verklaard worden door de lage effectiviteit van het vaccin.De effectiviteit van het vaccin kan per seizoen sterk verschillen. Dat komt omdat de samenstelling van het griepvaccin een half jaar van tevoren wordt bepaald op basis van de virussen die het seizoen ervoor in de wereld heersten. Griepvirussen kunnen echter veranderen of andere virussen kunnen overheersen tegen de tijd dat het griepseizoen in Nederland aanbreekt. Daardoor kan van tevoren nooit precies worden voorspeld welke virussen zullen overheersen.
Meldingsplichtige luchtweginfecties
Sommige luchtweginfecties moeten bij de GGD worden gemeld om te voorkomen dat ze zich verder verspreiden. Opvallend in 2017 was de toename van het aantal meldingen van legionella naar 561, het hoogste aantal ooit gerapporteerd. Het aantal gemelde gevallen van tuberculose (787) is gedaald. Het aantal meldingen van Q-koorts (23) en psittacose (52) bleef stabiel. Q-koorts, psittacose en legionella ziekten uiten zich meestal in de vorm van longontstekingen. Het aantal gemelde gevallen is een onderschatting van het werkelijke aantal, omdat vaak niet op deze ziekten wordt getest als mensen een longontsteking hebben. (aut. ref.)
The influenza epidemic of the 2018/2019 winter was mild and lasted 14 weeks. That is longer than the average period of nine weeks during the last 20 years, but it is shorter than the extended influenza epidemic of 2017/2018 which lasted 18 weeks. Between October 2018 and May 2019, a total of approximately 400,000 people became ill due to the influenza virus. Approximately 165,000 people consulted their general practitioner with influenza-like symptoms. Fewer people were admitted to the hospital as a result of influenza complications (mostly pneumonia). This number was estimated to be around 11,000, compared to 16,000 during the 2017/2018 flu season. Type A influenza virus was responsible for the majority of illnesses. There were 2,900 more deaths during the influenza epidemic than would normally be expected during this period.
Influenza vaccine effectiveness
During the 2018/2019 flu season, the influenza vaccine in the Netherlands reduced the risk of developing flu by 57%. This is about the same effect as in the previous flu seasons. In Europe, the vaccine was less effective against one of the most common circulating influenza viruses. An international study is being carried out to determine the reason for this. The effectiveness of the influenza vaccine can differ greatly from season to season. This is because the decision on the composition of the flu vaccine is made half a year beforehand. This is based on the viruses that were most common globally during the previous flu season. However, influenza viruses can change or other influenza viruses may dominate by the time the flu season breaks out in the Netherlands. This is why it is not possible to predict exactly which influenza viruses will circulate in the Netherlands in the next season.
Notifiable respiratory infections
Some respiratory infections have to be reported to the Public Health Services. They can then intensively monitor such infections and, if necessary, take timely action to prevent their further spread. The number of reports of legionella increased further in 2018 and reached 584, which is the highest number ever reported. The number of reports of tuberculosis (806), Q fever (18) and psittacosis (64) remained stable. Q fever, psittacosis and legionella generally manifest themselves in the form of pneumonia. The number of cases reported is an underestimation of the actual number. This is because tests are often not carried out for these illnesses if people have pneumonia.
PUBLIEKSSAMENVATTING
Griep
In de winter van 2017/2018 duurde de griepepidemie 18 weken. Dat is langer dan het gemiddelde van de afgelopen 20 jaar (negen weken). In totaal zijn tussen oktober 2017 en mei 2018 ongeveer 900.000 mensen ziek geworden door het griepvirus. Naar schatting bezochten 340.000 mensen de huisarts met griepachtige klachten. Daarnaast waren ziekenhuizen tijdelijk overbelast door de vele patiënten die vanwege complicaties van griep (meestal longontsteking) moesten worden opgenomen; naar schatting ruim 16.000. Ook zijn er tijdens de epidemie 9.500 meer mensen overleden dan gebruikelijk is in het griepseizoen (oktober tot mei). Tijdens de gehele epidemie zijn mensen vooral ziek geworden van het type B (Yamagata-lijn) griepvirus. Het is niet eerder voorgekomen dat een type B-griepvirus vanaf het begin van de epidemie overheerst
.
Effectiviteit griepvaccin
In het onderzochte seizoen heeft het vaccin bij 44 procent van de mensen die zich tegen de griep hebben laten vaccineren, voorkomen dat ze griepvirus B kregen. De Yamagata-lijn van griepvirus type B zat niet in het vaccin van het afgelopen seizoen. De redelijke bescherming die het vaccin bood komt doordat er wel een ander type B in zat. De lange duur van de griepepidemie kan dan ook niet verklaard worden door de lage effectiviteit van het vaccin.De effectiviteit van het vaccin kan per seizoen sterk verschillen. Dat komt omdat de samenstelling van het griepvaccin een half jaar van tevoren wordt bepaald op basis van de virussen die het seizoen ervoor in de wereld heersten. Griepvirussen kunnen echter veranderen of andere virussen kunnen overheersen tegen de tijd dat het griepseizoen in Nederland aanbreekt. Daardoor kan van tevoren nooit precies worden voorspeld welke virussen zullen overheersen.
Meldingsplichtige luchtweginfecties
Sommige luchtweginfecties moeten bij de GGD worden gemeld om te voorkomen dat ze zich verder verspreiden. Opvallend in 2017 was de toename van het aantal meldingen van legionella naar 561, het hoogste aantal ooit gerapporteerd. Het aantal gemelde gevallen van tuberculose (787) is gedaald. Het aantal meldingen van Q-koorts (23) en psittacose (52) bleef stabiel. Q-koorts, psittacose en legionella ziekten uiten zich meestal in de vorm van longontstekingen. Het aantal gemelde gevallen is een onderschatting van het werkelijke aantal, omdat vaak niet op deze ziekten wordt getest als mensen een longontsteking hebben. (aut. ref.)
Influenza epidemic
The influenza epidemic of the 2018/2019 winter was mild and lasted 14 weeks. That is longer than the average period of nine weeks during the last 20 years, but it is shorter than the extended influenza epidemic of 2017/2018 which lasted 18 weeks. Between October 2018 and May 2019, a total of approximately 400,000 people became ill due to the influenza virus. Approximately 165,000 people consulted their general practitioner with influenza-like symptoms. Fewer people were admitted to the hospital as a result of influenza complications (mostly pneumonia). This number was estimated to be around 11,000, compared to 16,000 during the 2017/2018 flu season. Type A influenza virus was responsible for the majority of illnesses. There were 2,900 more deaths during the influenza epidemic than would normally be expected during this period.
Influenza vaccine effectiveness
During the 2018/2019 flu season, the influenza vaccine in the Netherlands reduced the risk of developing flu by 57%. This is about the same effect as in the previous flu seasons. In Europe, the vaccine was less effective against one of the most common circulating influenza viruses. An international study is being carried out to determine the reason for this. The effectiveness of the influenza vaccine can differ greatly from season to season. This is because the decision on the composition of the flu vaccine is made half a year beforehand. This is based on the viruses that were most common globally during the previous flu season. However, influenza viruses can change or other influenza viruses may dominate by the time the flu season breaks out in the Netherlands. This is why it is not possible to predict exactly which influenza viruses will circulate in the Netherlands in the next season.
Notifiable respiratory infections
Some respiratory infections have to be reported to the Public Health Services. They can then intensively monitor such infections and, if necessary, take timely action to prevent their further spread. The number of reports of legionella increased further in 2018 and reached 584, which is the highest number ever reported. The number of reports of tuberculosis (806), Q fever (18) and psittacosis (64) remained stable. Q fever, psittacosis and legionella generally manifest themselves in the form of pneumonia. The number of cases reported is an underestimation of the actual number. This is because tests are often not carried out for these illnesses if people have pneumonia.
The influenza epidemic of the 2018/2019 winter was mild and lasted 14 weeks. That is longer than the average period of nine weeks during the last 20 years, but it is shorter than the extended influenza epidemic of 2017/2018 which lasted 18 weeks. Between October 2018 and May 2019, a total of approximately 400,000 people became ill due to the influenza virus. Approximately 165,000 people consulted their general practitioner with influenza-like symptoms. Fewer people were admitted to the hospital as a result of influenza complications (mostly pneumonia). This number was estimated to be around 11,000, compared to 16,000 during the 2017/2018 flu season. Type A influenza virus was responsible for the majority of illnesses. There were 2,900 more deaths during the influenza epidemic than would normally be expected during this period.
Influenza vaccine effectiveness
During the 2018/2019 flu season, the influenza vaccine in the Netherlands reduced the risk of developing flu by 57%. This is about the same effect as in the previous flu seasons. In Europe, the vaccine was less effective against one of the most common circulating influenza viruses. An international study is being carried out to determine the reason for this. The effectiveness of the influenza vaccine can differ greatly from season to season. This is because the decision on the composition of the flu vaccine is made half a year beforehand. This is based on the viruses that were most common globally during the previous flu season. However, influenza viruses can change or other influenza viruses may dominate by the time the flu season breaks out in the Netherlands. This is why it is not possible to predict exactly which influenza viruses will circulate in the Netherlands in the next season.
Notifiable respiratory infections
Some respiratory infections have to be reported to the Public Health Services. They can then intensively monitor such infections and, if necessary, take timely action to prevent their further spread. The number of reports of legionella increased further in 2018 and reached 584, which is the highest number ever reported. The number of reports of tuberculosis (806), Q fever (18) and psittacosis (64) remained stable. Q fever, psittacosis and legionella generally manifest themselves in the form of pneumonia. The number of cases reported is an underestimation of the actual number. This is because tests are often not carried out for these illnesses if people have pneumonia.
Gegevensverzameling