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Vectors01:30

Vectors

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Vectors are mathematical entities characterized by both magnitude and direction. Unlike scalars, which are defined solely by magnitude, vectors represent quantities like displacement, velocity, and force, where direction is essential. Vectors are graphically represented as directed line segments, extending from an initial point to a terminal point, denoted with bold letters or arrows placed above the symbol. Two vectors are deemed equal if they share identical magnitudes and directions,...
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Principles of Disease Surveillance01:26

Principles of Disease Surveillance

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Disease surveillance is the systematic collection, analysis, and interpretation of health data essential to the planning, implementation, and evaluation of public health practice. This process integrates data dissemination to entities responsible for preventing and controlling disease, injury, and disability. Surveillance systems provide crucial information for action, helping public health authorities make informed decisions to manage and prevent outbreaks, ensure public safety, optimize...
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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
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In everyday conversation, accelerating means speeding up. Acceleration is a vector in the same direction as the change in velocity, Δv, therefore the greater the acceleration, the greater the change in velocity over a given time. Since velocity is a vector, it can change in magnitude, direction, or both. Thus acceleration is a change in speed or direction, or both. For example, if a runner traveling at 10 km/h due east slows to a stop, reverses direction, and continues their run at 10 km/h...
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Vectors are physical quantities that have both magnitude and direction. The vector operations include addition, subtraction, and scalar multiplication.
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Detecting Virus and Salivary Proteins of a Leafhopper Vector in the Plant Host
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Vector surveillance for West Nile virus.

D J White1

  • 1Arthropod-Borne Disease Program, New York State Department of Health, Albany 12237, USA. djw05@health.state.ny.us

Annals of the New York Academy of Sciences
|January 19, 2002
PubMed
Summary

West Nile virus (WNV) surveillance in New York detected WNV in mosquitoes across multiple regions in 2000. This indicates WNV has spread throughout the state, necessitating ongoing vector surveillance for public health.

Area of Science:

  • Public Health Entomology
  • Arbovirology
  • Vector-borne Disease Surveillance

Background:

  • West Nile virus (WNV) emerged in New York City (NYC) in 1999, causing significant human illness and fatalities.
  • The New York State Department of Health (NYSDOH) established a statewide surveillance system to monitor WNV and mosquito populations.
  • A standardized WNV response plan was developed for local health departments (LHD) to assess mosquito data and WNV circulation.

Purpose of the Study:

  • To assess the effectiveness of the statewide mosquito and WNV surveillance system implemented by NYSDOH.
  • To evaluate the data collected by LHDs on mosquito populations and WNV presence during the 2000 arbovirus season.
  • To understand the geographic distribution and potential spread of WNV within New York State (NYS) and beyond.

Main Methods:

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  • Collection and testing of 317,676 mosquitoes from 26 counties during the 2000 surveillance season.
  • Virus isolation and identification using NYSDOH's polymerase chain reaction (PCR) testing on 9,952 mosquito pools.
  • Larval and adult mosquito surveillance by LHDs for habitat characterization, species documentation, density, and virus infection rates (MIR).

Main Results:

  • 363 WNV-positive mosquito pools were detected by PCR testing.
  • WNV was identified in eight mosquito species across NYC, Long Island, and four counties in the lower Hudson River valley.
  • Surveillance provided crucial data on mosquito species, density, seasonal activity, and WNV presence, informing control interventions.

Conclusions:

  • The implemented surveillance system successfully detected WNV circulation in mosquito populations across multiple regions of NYS.
  • Findings suggest WNV has dispersed throughout NYS and poses a potential future risk to adjacent states and Canada.
  • Continued vector surveillance is essential for LHD programs to manage public health risks associated with WNV.