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Surveillance: An Overview

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Presentation on theme: "Surveillance: An Overview"— Presentation transcript:

1 Surveillance: An Overview
Prof Ahmed Mandil KSU College of Medicine

2 Headlines Public health approach Definitions
April 15, 2017 Headlines Public health approach Definitions Components of a Surveillance System Reporting and Feedback Steps of Surveillance Uses of Surveillance Data Examples of Surveillance Activities 15 April 2017 Surveillance A Small Dose of Toxicology - Overview

3 Public Health Approach
Implementation: How do you do it? Intervention Evaluation: What works? Risk Factor Identification: What is the cause? Surveillance: What is the problem? Problem Response 15 April 2017 Surveillance

4 Definitions (I) Register: a list of persons or disease cases in a community, organization or group of people which does not have a control component (as in a surveillance system). An example is cancer registers such as the National Cancer Registry in Riyadh Monitoring system: a general term describing a system for watching or checking on a person or thing Surveillance of disease: continuous scrutiny of all aspects of occurrence and spread of disease that are pertinent to effective control 15 April 2017 Surveillance

5 Definitions (III) Surveillance of persons: continuous scrutiny of disease contacts or high risk groups in order to promote recognition of infection or illness Sentinel event: "a preventable disease / disability/death whose occurrence serves as a warning that prevention may need to be improved". Sentinel surveillance represents a wide range of activities that focus on key health indicators in the population. 15 April 2017 Surveillance

6 Surveillance: Comprehensive Definition
Ongoing, systematic collection, analysis, and interpretation of data essential to planning, implementation, and evaluation of interventions, closely integrated with the timely dissemination of these data to other stake holders (e.g. health professionals, public officials, international agencies, general public) 15 April 2017 Surveillance

7 Components (I): Introduction
A surveillance system is a monitoring process with a control system. The key words in such a system are: registration and monitoring of disease occurrence. It simulates a thermostat in a home with central heat and air-conditioning. Inhabitants of the home set the desired (comfortable) temperature on a thermostat. The thermostat 's thermometer "senses" temperature. It then compares the "actual" with "desired" temperature. It sends "control signals" to the heater or the air conditioner: if the temperature is too high, the air-conditioner goes on; conversely, if the temperature is too low, the heat goes on. 15 April 2017 Surveillance

8 Components (II) Similarly, the components of a surveillance are:
Sensor: identifies the state of health. Examples are: local physicians (for notifiable diseases), health workers, labs (for routine sampling, e.g. for genetic disorders), teachers & school nurses (for disease-related absenteeism), industrial physicians, or annual examination of the military Reference Signal: the output of the sensor 15 April 2017 Surveillance

9 Components (III) Monitor & Expectations: compares the reference signal with "expectations". This is usually an epidemiologist, who compares the disease occurrence with a prior expectation (threshold of concern) and responds accordingly. Error Signal: output of the monitor which measures difference between performance (reference signal) and expectation. Example: morbidity & mortality weekly reports. Controller: person or organization that takes corrective action aimed at reducing the error signal, i.e. initiates prevention and control activities. This might be the local health officer (regionally), or the chief medical officer (e.g. minister of health) if a national decision is needed. 15 April 2017 Surveillance

10 Sensor Controller Monitor Expectations
(Reporters) Reference Signal (Sensor output) Controller (Decision maker) Monitor Error Signal (Monitor output) Expectations COMPONENTS OF A SURVEILLANCE SYSTEM 15 April 2017 Surveillance

11 Feedback & Reporting Passive reporting: mailing printed forms by physicians and nurses of all cases of reportable diseases observed in previous week, or telephone reporting in other cases. Active Reporting: ministry of health contacts physicians and nurses at periodic intervals requesting data on specific diseases. (not as common as passive reporting) 15 April 2017 Surveillance

12 Steps for Surveillance
Defining the problem Collecting data Entering / processing data Interpreting data Reporting results Using results to plan interventions Evaluating the surveillance system Updating the system 15 April 2017 Surveillance

13 Surveillance Sources (Communicable Diseases)
Morbidity and mortality reports; Reports of field investigations of epidemics and individual cases Lab isolation and identification of infectious agents Data concerning vaccines, toxoid, immune globulins, and insecticides Immunity levels in segments of the population. 15 April 2017 Surveillance

14 . Surveillance Sources (Non-Communicable Diseases)
Notifiable diseases: lead poisoning reporting systems Vital statistics (death certificates) Sentinel surveillance (SENSOR): for occupational risks Disease registries: cancer, ARF/RHD registries Health surveys: behavioral risk factor telephone surveys Census data: poverty rates by district/region/city 15 April 2017 Surveillance

15 Uses of Surveillance Estimate magnitude of the problem
Portray the natural history of a disease Determine distribution and spread of illness Detect outbreaks Generate hypotheses, stimulate research Evaluate control and prevention measures Monitor changes in infectious agents Detect changes in health practices Facilitate planning 15 April 2017 Surveillance

16 Uses of Public Health Surveillance
Estimate magnitude of the problem Portray the natural history of a disease Determine distribution and spread of illness Detect outbreaks Generate hypotheses, stimulate research Evaluate control measures Monitor changes in infectious agents Detect changes in health practices Facilitate planning 15 April 2017 Surveillance

17 Reported cases per 100,000 population
Shigellosis 5 10 15 Year 1968 1973 1978 1983 1988 1993 1998 Reported cases per 100,000 population Source: CDC. Summary of notifiable diseases

18 Uses of Public Health Surveillance
Estimate magnitude of the problem Portray the natural history of a disease Determine distribution and spread of illness Detect outbreaks Generate hypotheses, stimulate research Evaluate control measures Monitor changes in infectious agents Detect changes in health practices Facilitate planning 15 April 2017 Surveillance

19 TOXIC SHOCK SYNDROME (TSS)
United States, 160 National Center for Infectious Diseases (NCID) data* National Electronic Telecommunications System for Surveillance (NETSS) data 140 120 Reported cases 100 80 60 40 20 1992 Year (Quarter) 1989 1983 *Includes cases meeting the CDC definition for confirmed and probable cases for staphylococcal TSS. 1984 1985 1986 1987 1988 1990 1991 1993 1994 1995 1996 1997 1998 15 April 2017 Surveillance

20 Uses of Public Health Surveillance
Estimate magnitude of the problem Portray the natural history of a disease Determine distribution and spread of illness Detect outbreaks Generate hypotheses, stimulate research Evaluate control measures Monitor changes in infectious agents Detect changes in health practices Facilitate planning 15 April 2017 Surveillance

21 TOXIC SHOCK SYNDROME (TSS)
United States, 160 National Center for Infectious Diseases (NCID) data* National Electronic Telecommunications System for Surveillance (NETSS) data 140 120 Reported cases 100 80 60 40 20 1992 Year (Quarter) 1989 1983 *Includes cases meeting the CDC definition for confirmed and probable cases for staphylococcal TSS. 1984 1985 1986 1987 1988 1990 1991 1993 1994 1995 1996 1997 1998 15 April 2017 Surveillance

22 Uses of Public Health Surveillance
Estimate magnitude of the problem Portray the natural history of a disease Determine distribution and spread of illness Detect outbreaks Generate hypotheses, stimulate research Evaluate control measures Monitor changes in infectious agents Detect changes in health practices Facilitate planning 15 April 2017 Surveillance

23 Botulism (Foodborne) United States, 1978-1998
10 20 30 40 50 60 70 80 90 100 110 Laboratory-confirmed cases* Outbreak caused by potato salad, NM NETSS data Outbreak caused by sautéed onions, IL Outbreak caused by baked potatoes, TX Outbreak caused by fermented fish/sea products, AK Reported cases 1978 1983 1988 1993 Year 1998 Source: CDC. Summary of notifiable diseases *Data from survey of state epidemiologists and directors of state public health laboratories. Not yet available for 1998.

24 Examples (I) For diseases:
Communicable diseases: influenza, HIV/AIDS, sexually-transmitted infections For disease outbreaks: e.g. food poisoning, salmonelosis, cholera Non-communicable diseases: lead poisoning, cancer, hypertension, diabetes Risk factors: tobacco use, physical exercise 15 April 2017 Surveillance

25 Examples (II) For emergencies: bioterrorism, chemical, radiation, natural disasters For hospitals: e.g. nosocomial infections. In the industry: for occupational disorders. In the military: for diseases of the recruits 15 April 2017 Surveillance

26 References Teutsch SM, Churchill RE. Principles and practice of public health surveillance. Oxford: Oxford university press, 2000 Surveillance of communicable disease surveillance: Surveillance of emergencies: Surveillance of non-communicable disease risk factors: 15 April 2017 Surveillance

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