The phrase "and spread at a" is not complete and lacks context, making it difficult to determine its correctness in written English.
It could potentially be used in a sentence where the action of spreading is being described, but it needs additional information to clarify its meaning.
Example: "The seeds were scattered and spread at a consistent rate across the field."
Alternatives: "and distributed at a" or "and dispersed at a".
The fire began in the southeast corner of the H-shaped structure and spread at a furious speed.
Their creation — a network by which home music databases could be exchanged online — caught on and spread at a phenomenal rate.
The infrastructure facilities, service industry, housing and office spaces, power distribution facilities have increased and spread at a high pace.
Those of us who are old enough to remember when an unknown virus took root in the United States in the 1980s and spread at a rate so alarming that few believed that it could be quelled know why the annual acknowledgment of World AIDS Day is so important.
Since then, the conflict has intensified and spread at a rapid rate, prompting the U.N. to warn of a potential genocide and the exacerbation of "already alarming" levels of food insecurity, compounded by a drop in oil prices and sky-high inflation.
There are three explanations for this broad taxonomic distribution of phototrophic metabolism; it evolved in one lineage of eubacteria and spread at a later time to other lineages by horizontal transfer, the common ancestor of these groups possessed this metabolism and genetic machinery, or there was a combination of horizontal transfer and vertical inheritance [ 4].
Since 1997 the international community has witnessed a strain of highly pathogenic H5N1 avian influenza virus emerge and spread at an unprecedented rate.
The Ebola outbreak is "the largest, most complex and most severe we've ever seen", said Chan and spreading at a pace that outstrips effort to control it.
Its density of 1.02778 causes it to sink to the bottom of the Mediterranean and overflow across the submarine sill at the Strait of Gibraltar, whence it sinks and spreads at a depth of about 1,000 metres (3,300 feet) in the Atlantic.
Monolayers of zwitterionic DPPC (dipalmitoylphosphatidylcholine) and negatively charged cardiolipin (BHCL and TMCL) were spread at an initial surface pressure of 20 mN/m.
