In general, no - an outbreak is a sudden increase in cases above the normal level of disease in a population. Since there are usually some cases of any given disease happening in a population, one case is usually not enough to qualify as an outbreak.
index case
A foodborne outbreak is typically defined as an incident in which two or more people experience similar illnesses after consuming the same contaminated food or beverage. Therefore, the minimum number of affected individuals for it to be classified as an outbreak is two. If only one person is affected, it is considered a single case rather than an outbreak.
die
The most tornadoes recorded in a single outbreak is 219 on April 27, 2011, during the Super Outbreak in the United States. This outbreak affected several states in the southern and eastern U.S., resulting in widespread devastation and loss of life.
It takes 2 cases of people with the same causative agent to be classified as an outbreak. Once upon a time, just one case of botulism was considered an outbreak.
It is used to identify single strains of bacteria therefore, tracing the outbreak of infections.
The Super Tuesday Tornado Outbreak was not a single tornado. It was an outbreak of 86 tornadoes across a large portion of the southeastern U.S. The worst hit areas were in Arkansas, Tennessee, Kentucky, and Alabama.
Not in a single outbreak. The current record for number of F5 tornadoes in a single outbreak is 6, (some say 7 as one rating is disputed) which is also the 1-year record. You might see 90 F5 tornadoes occur in a 100 year period.
The ratio of a single case is 1.
If six or more tornadoes form in one day from the same storm system it is called a tornado outbreak. A tornado outbreak can last anywhere from a few hours to a few days.
The term for the person who is the source of epidemic outbreak is "index case" or "patient zero." This individual is typically the first person to become infected and can spread the disease to others.
The 1974 outbreak was not a single tornado but series of 148 tornadoes. It is famous because it was the most intense as well as one of the deadliest and until recently the biggest of all tornado outbreaks on record.