The phrase "allowed it to spread" is correct and usable in written English.
You can use it when discussing the permission or facilitation of something expanding or increasing in scope, such as an idea, disease, or influence.
Example: "The lack of intervention allowed it to spread rapidly throughout the community."
Alternatives: "permitted it to expand" or "let it proliferate."
When the crisis hit, first in America, then in Europe, the absence of barriers allowed it to spread instantly.
But full protection since 1981 has allowed it to spread back over much of the Scottish landscape, and the aim now is to bring it back south of the border.
Investigators had no leads on the cause of the fire by Thursday afternoon but said it appeared to have spread from the second floor to an attic space, which allowed it to spread quickly through the two-story, 40-unit motel.
Not only has the epidemic struck a highly mobile population, which has allowed it to spread to urban areas such as Monrovia, the capital of Liberia with a population of about 1 million, but after years of debilitating civil war and insurgency the local population has shown scepticism towards the support offered by health workers and national authorities.
These characteristics allowed it to spread rapidly to sites situated at a range of different altitudes.
By refusing to come together under one banner other than the word "Occupy," they've both diluted their message and allowed it to spread more quickly.
The firm's breadth allows it to spread its bets and seize opportunities.
However, Wildblue says the capability of Viasat-1 also allows it to spread its appeal to those locations that simply have a poor broadband experience.
The panel also wants to build a completely new human tumor database that would probe not only mutations that trigger cancer in a person, but the 3D complex of immune and other cells surrounding a tumor that help sustain its growth and allow it to spread.
Even though the calcium chloride is already diluted, diluting it further can extend its volume and allow it to spread more evenly throughout the milk.
After coming under criticism for trying to cover up the extent of its SARS epidemic and thus allowing it to spread around the world, China has been at pains to demonstrate new openness and preparedness to fight future outbreaks.
