Find related topics. | Discover entities. | See connections. | Build a topical map.
Index case: Examples, Term & Non-medical usage
The index case or patient zero is the first documented patient in a disease epidemic within a population, or the first documented patient included in an epidemiological study. It can also refer to the first case of a condition or syndrome (not necessarily contagious) to be described in the medical literature, whether or not the patient is thought to be…
Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.
More settings
Index case topic overview
The analysis highlights Examples, Term and Non-medical usage as prominent areas in the source structure around Index case.
Related topics
53
Source areas
4
Connected nodes
57
Extracted relationships
53
Related term clusters
24
Bridge connections
57
What this topic covers Research coverage
Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.
Examples · 31 topics
Term · 16 topics
Overview · 5 topics
Non-medical usage · 1 topics
Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.
Key facts & relationships
High-confidence facts extracted from structured source data. Use them as anchors for further research.
Start with your topic. Discover where to go next.
Explore different angles and find fresh ideas to shape your next piece of content.
A structured outline of related entities, concepts and subtopics. Open any item to build a new map centered on it.
Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.
You can skip this section if you’re here for content ideas and keyword inspiration.
Advanced semantic analysis
How Index case connects Entity context
Entity context groups extracted connections by relationship type. Counts show recurrence in the analyzed source; the examples are research signals, not claims about importance.
The extracted context around Index case shows recurring relationship patterns in the source. For example, Index case → Another, Broad Street, COVID-19, December, Doctors, Ebola, England, Enrique Hernández, Frances Lewis, Gregg Garfield, Guangdong, Guinea, Hernández, Hong Kong Metropole Hotel, Huanan Seafood Wholesale Market, Jesus Lujan, Lewis House, Liu Jianlun, London, Los Angeles Another extracted example is Index case → Band Played On, California, CDC, Centers, COVID-19, Disease Control, Dugas, Ebola, Gaëtan Dugas, Guinea, HIV, HIV-patients, Los Angeles, Patient, Patient Zero, Prevention, Randy Shilts, San Francisco Chronicle, That's, United States. Use these groups to spot repeated connection types before inspecting the individual relationships.
Index case
Top relations
related to Others· 30
Index case → Another, Broad Street, COVID-19, December, Doctors, Ebola, England, Enrique Hernández, Frances Lewis, Gregg Garfield, Guangdong, Guinea, Hernández, Hong Kong Metropole Hotel, Huanan Seafood Wholesale Market, Jesus Lujan, Lewis House, Liu Jianlun, London, Los Angeles
related to Origin of patient zero· 21
Index case → Band Played On, California, CDC, Centers, COVID-19, Disease Control, Dugas, Ebola, Gaëtan Dugas, Guinea, HIV, HIV-patients, Los Angeles, Patient, Patient Zero, Prevention, Randy Shilts, San Francisco Chronicle, That's, United States
is a· 1
Index case → case of the original patient
related to Term· 1
Index case → Earlier
Important terminology
Frequent words and multi-word phrases across the lead, headings, infobox and body. Useful for terminology coverage.
Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.
Index case relationships Subject–Predicate–Object triples
Relationships are represented as Subject → Predicate → Object triples. Confidence describes extraction strength, not the real-world importance of a relationship; lower-confidence rows may be contextual rather than explicit.
TTTA extracted 53 structured relationships around Index case. Examples in this analysis include Index case → is a → case of the original patient and Index case → related to Origin of patient zero → Patient. The table shows each extracted connection, where it came from and its confidence.
Subject
Predicate
Object
Confidence
Src
Index case
is a
case of the original patient
0.90
text
Index case
related to Origin of patient zero
Patient
0.60
section
Index case
related to Origin of patient zero
HIV
0.60
section
Index case
related to Origin of patient zero
United States
0.60
section
Index case
related to Origin of patient zero
Gaëtan Dugas
0.60
section
Index case
related to Origin of patient zero
Dugas
0.60
section
Index case
related to Origin of patient zero
Centers
0.60
section
Index case
related to Origin of patient zero
Disease Control
0.60
section
Index case
related to Origin of patient zero
Prevention
0.60
section
Index case
related to Origin of patient zero
CDC
0.60
section
Index case
related to Origin of patient zero
HIV-patients
0.60
section
Index case
related to Origin of patient zero
California
0.60
section
No triples extracted yet.
Related concept clusters Related term clusters
Related term clusters group terms that sit near one another in the extracted graph. They are useful for discovering adjacent language and context, but proximity does not by itself imply a factual relationship.
The concept neighborhoods around Index case bring nearby vocabulary together. In this analysis, examples include Outbreak, Index and Primary. Use the clusters to find adjacent concepts and terminology that may deserve separate research.
Index case
Outbreak
Index
Primary
Known
Patient
May
Source
Study
Zero
Disease
Outbreaks
Population
patient
Zero
Outbreak
Covid-19
Pandemic
Gaëtan
May
Source
Dugas
Study
Virus
Outbreaks
Known
gaëtan dugas
Dugas
Gaëtan
States
United
Source
Spread
Outbreak
Term
Zero
Index
Patient
Outbreaks
largest ebola virus outbreak
Source
Outbreaks
Patient
Term
Zero
Covid-19
Days
Epidemic
Known
May
Ebola
Outbreak
index case
Outbreak
Index
Disease
Refer
Primary
Source
Known
Patient
Term
May
Outbreaks
Population
disease epidemic
Outbreaks
Primary
Term
Patient
Zero
Epidemiological
Index
Population
Cdc
Epidemic
Others
Refer
disease
Outbreaks
Primary
Term
Patient
Zero
Index
Population
Cdc
Epidemic
Others
Refer
May
centers for disease control and prevention
Outbreaks
Primary
Term
Patient
Zero
Index
Population
Cdc
Epidemic
Others
Refer
May
Connections between topic areas Semantic bridges
Semantic bridges connect parts of the graph that would otherwise be more separate. A bridge is a structural signal in this analysis, not a claim that the two topic areas are equivalent.
For Index case, one of the stronger structural bridges in this analysis connects Index case with Examples. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.
Min side: 3
Index case — Examples· splits 26 ⟂ 32Index case — Term· splits 41 ⟂ 17Index case — Overview· splits 52 ⟂ 6
Map overview Semantic statistics
Number of nodes, edges, triples, density and central hubs. Use it to gauge the size and connectivity of the map.
Index case
Nodes58
Edges57
Triples53
Avg. degree1.97
Density0.034483
Components1
Source & methodology
TTTA analyzes the structure around Index case to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as Examples, Term & Non-medical usage, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.
