Question: What is the amount per millilitre of seawater that bacteriophages occupy?
About the article "Virus", section "Bacterial viruses".

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Bacteriophages are a common and diverse group of viruses and are the most abundant form of biological entity in aquatic environments – there are up to ten times more of these viruses in the oceans than there are bacteria, reaching levels of 250,000,000 bacteriophages per millilitre of seawater.
These viruses infect specific bacteria by binding to surface receptor molecules and then entering the cell.
Within a short amount of time, in some cases just minutes, bacterial polymerase starts translating viral mRNA into protein.
These proteins go on to become either new virions within the cell, helper proteins, which help assembly of new virions, or proteins involved in cell lysis.
Viral enzymes aid in the breakdown of the cell membrane, and, in the case of the T4 phage, in just over twenty minutes after injection over three hundred phages could be released.
The major way bacteria defend themselves from bacteriophages is by producing enzymes that destroy foreign DNA.
These enzymes, called restriction endonucleases, cut up the viral DNA that bacteriophages inject into bacterial cells.
Bacteria also contain a system that uses CRISPR sequences to retain fragments of the genomes of viruses that the bacteria have come into contact with in the past, which allows them to block the virus's replication through a form of RNA interference.
This genetic system provides bacteria with acquired immunity to infection.
ListShield is an Intralytix product that is applied to food for the prevention of listeriosis by killing strains of food-borne pathogenic "Listeria monocytogenes" bacteria.
Listeriosis is a serious disease with a high rate of mortality in susceptible individuals.
It is almost exclusively contracted by consuming contaminated food.
Since the "L. monocytogenes" bacteria are omnipresent in nature, even the most thorough hygiene concepts fail to guarantee that food products are free of listeria.
Bacteriophages are among the best studied organisms in the natural world.
This is because their molecular biology is relatively simple.
Many molecular principles were first studied in bacteriophages prior to being found in higher organisms.
Bacteriophages are ubiquitous.
High numbers can be found in seawater and also in fermented foods such as yogurt or cheese.
Bacteriophages are extremely specific in the bacteria they recognize.
The recognition is often limited to specific strains of one species, in rare cases several strains of the same species or genus are recognized.
With this fact in mind their potential in fighting unwanted bacteria has recently received increased attention.
ListShield is aqueous, phage preparation containing six listeria-specific bacteriophages designed to attack a very broad spectrum of "Listeria monocytogenes" strains. 
In Laos, bear bile can sell for 120,000 kip (~US$15) per millilitre (with 240,000 kip being the average monthly wage in the country).
the number of bile bears is estimated at more than 100 individuals. 
Bacteria can be detected with a urine dipstick test for urinary nitrite or by urinary microscopy, although bacterial culture remains the most specific and formal test (the golden standard).
Bacteriuria can be confirmed if a single bacterial species is isolated in a concentration greater than 100,000 colony forming units per millilitre of urine in clean-catch midstream urine specimens (one for men, two consecutive specimens with the same bacterium for women).
For urine collected via bladder catheterisation, the threshold is 100 colony forming units of a single species per millilitre.
The threshold is also 100 colony forming units of a single species per millilitre for women displaying UTI symptoms. 
One cubic centimetre is equal to 1 millilitre, under the current SI system of units.