Question: Are separate specimens necessary for covid and TB?

Answer passage (source: WHO):
page_title: Q&A: Tuberculosis and COVID-19
section_headers: Should all people being evaluated for tuberculosis also be tested for COVID-19 and vice-versa?
section_content: Testing of the same patient for both tuberculosis (TB) and COVID-19 would
generally be indicated for three main reasons, subject to the specific setting
in each country:

clinical features that are common to both diseases; or 
simultaneous exposure to both diseases; or
presence of a risk factor 

As the pandemic advances, more people of all ages, including TB patients, will
be exposed to COVID-19. The Information Note
contains
further considerations for simultaneous testing for the two diseases.

Reviewer feedback on this answer:
It doesn't address the answer directly, it talks about why teh same person needs to be tested for both but doesn't say if the same specimen can be used for both.
This answer does not relate to share specimen, but only testing at the same time, which is what the question seeks to answer.

Reviewer ratings:
Bad
Bad

Answer passage (source: WHO):
page_title: Q&A: Tuberculosis and COVID-19
section_headers: Can tuberculosis and COVID-19 be tested on the same type of specimen?
section_content: The diagnostic methods for tuberculosis (TB) and COVID-19 are quite distinct
and commonly require different specimens.  
Sputum, as well as many other biological specimens, can be used to diagnose TB
using culture or molecular techniques.  
Tests for COVID-19 are done most commonly by nasopharyngeal or oropharyngeal
swab or wash in ambulatory patients, but sputum or endotracheal aspirate or
bronchoalveolar lavage may be used in patients with severe respiratory
disease. Molecular testing is the currently recommended method for the
identification of infectious COVID-19 and just as for TB, serological assays
are not recommended for the routine diagnosis of COVID-19.
The pipeline for COVID-19 diagnostics has flourished impressively within a few
months. Amongst these is the Xpert® Xpress SARS-CoV-2 cartridge for use on
GeneXpert machines, which are machines used in TB diagnosis. WHO is currently
evaluating this cartridge as well as other tests. Additional resources to roll
out COVID-19 testing should be mobilized rather than relying only on existing
resources that are used for TB, to ensure that the diagnostic coverage for TB
is maintained as necessary.

Reviewer feedback on this answer:
The answer directly answers the question right away and then provides details explaining why the specimens need to be different.
This answer relates and efficiently answers the question while giving more detailed information.

Reviewer ratings:
Excellent
Excellent

Answer passage (source: WHO):
page_title: Q&A: Tuberculosis and COVID-19
section_headers: Do COVID-19 and tuberculosis spread in the same way?
section_content: While both tuberculosis (TB) and COVID-19 spread by close contact between
people the exact mode of transmission differs, explaining some differences in
infection control measures to mitigate the two conditions.  
TB bacilli remain suspended in the air in droplet nuclei for several hours
after a TB patient coughs, sneezes, shouts, or sings, and people who inhale
them can get infected. The size of these droplet nuclei is a key factor
determining their infectiousness. Their concentration decreases with
ventilation and exposure to direct sunlight.  
COVID-19 transmission has primarily been attributed to the direct breathing of
droplets expelled by someone with COVID-19 (people may be infectious before
clinical features become apparent). Droplets produced by coughing, sneezing,
exhaling and speaking may land on objects and surfaces, and contacts can get
infected with COVID-19 by touching them and then touching their eyes, nose or
mouth . Handwashing, in addition to respiratory precautions, are thus
important in the control of COVID-19.

Reviewer feedback on this answer:
This answer relates to transmission, not the shared specimen test that was asked in the original question.
This answer talks about transmiting the two diseases and has nothing to do with testing for the diseases which was the question.

Reviewer ratings:
Bad
Bad