Table 1 PCR serotyping results from pneumococcal culture-negative specimens by lytA status, USA, 2015–2016.

From: Streptococcus mitis Expressing Pneumococcal Serotype 1 Capsule

PCR Serotyping Results*

lytA positive specimens

lytA negative specimens

(N = 53)

(N = 395)

n (%)

n (%)

001

8 (15.1)

41 (10.4)

004

9 (16.9)

37 (9.4)

9V/9A#

6 (11.3)

32 (8.1)

005

1 (1.9)

11 (2.8)

18A/18B/18C/18F#

7 (13.2)

25 (6.3)

23A

2 (3.8)

4 (1.0)

19F

1 (1.9)

0 (0)

14

0

2 (0.5)

12F/12A/12B/44/46#

1 (1.9)

9 (2.3)

Others

2 (3.8)

13 (3.3)

Negative for the serotypes tested by PCR

26 (49.1)

264 (66.8)

  1. Specimens were nasopharyngeal and oropharyngeal samples from 448 adults aged ≥65 years; those from adults with lytA-positive PCR results from either specimen were classified as lytA positive; those with both specimens testing lytA negative were classified as lytA negative.
  2. *Not mutually exclusive.
  3. #PCR reaction groups these serotypes.
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