Sentence examples for are initially negative from inspiring English sources

Standard HIV tests, which measure antibodies to the virus, are initially negative, because HIV antibodies generally do not reach detectable levels in the blood until a few weeks after the onset of the acute illness.

For these two reasons, a repeat screening procedure is indicated in Gambian TB case contacts that are initially negative.

Follow up for a year is essential as a significant proportion of cases are initially negative and are only detected at a later stage.

Followup for a year is essential as a significant proportion of cases are initially negative and are only detected at a later stage by either detection of blood parasites or by seroconversion.

When influenza suspicion is high, obtaining bronchoalveolar lavage specimens for viral culture, PCR, and antigen testing should be considered if nasopharyngeal sampling and testing for influenza antigen and viral culture are initially negative.

As you know and as the mayor has talked about, those tests were initially negative".

In 2008, the general commentary on Mrs. Clinton's emotional response to a question from a voter was initially negative.

Publicly, many of the reactions were initially negative.

Many S. chartarum samples were initially negative after PCR amplification.

However, one A. fumigatus sample was initially negative after PCR amplification.

The clinical examination result is initially negative and may appear only when the duodenal contents enter the peritoneal cavity.