“Apparent infection rate”的意思、由来-开放百科全书

词条

Apparent infection rate

释义

See also
References

Apparent infection rate is an estimate of the rate of progress of a disease, based on proportional measures of the extent of infection at different times.

Firstly, a proportional measure of the extent of infection is chosen as the disease extent metric. For example, the metric might be the proportion of leaf area affected by mildew, or the proportion of plants in a population showing dieback lesions. Measures of disease extent are then taken over time, and a mathematical model is fit. The model is based upon two assumptions:

the progress of the infection is constrained by the amount of tissue that remains to be infected; and
if it were not so constrained, the extent of infection would exhibit exponential growth.

There is a single model parameter r, which is the apparent infection rate. It can be calculated analytically using the formula

where

r is the apparent infection rate

t₁ is the time of the first measurement

t₂ is the time of the second measurement

x₁ is the proportion of infection measured at time t₁

x₂ is the proportion of infection measured at time t₂

References

{{cite book | author = Parry, David W. | year = 1990 | title = Plant pathology in agriculture | publisher = Cambridge University Press | isbn = 0-521-36890-1 | pages = 66–67}}

2 : Epidemiology|Mathematical modeling

随便看

开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。

See also

References