Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2021 Jun 15;201:111514. doi: 10.1016/j.envres.2021.111514

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2021 Elsevier Inc. All rights reserved.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

PMC Copyright notice

Fig. 5 — Relationship of the coefficient of correlation (Import-Export/confirmed cases) on coefficient of correlation (population density/confirmed cases). Note: circle with continuous line and highlighted with light yellow color indicates the period of national lockdown in Italy. Circle with dotted line and highlighted with green color indicates the period of on-going containment measures with three cluster areas of regions. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)