Viruses cannot pick up gram staining because it does not have the cell wall of a bacteria.
neither it is not stain-able because it is a virus
Lassa fever is a virus. It does not have a gram stain characteristic.
Bacteria stain either gram-positive or gram-negative based on the presence or absence of a cell wall. Viruses do not pick up a gram stain.
HPV is a virus. Viruses aren't gram stained.
Most likely nothing. The gram stain will only stain the peptidoglycan cell wall of bacteria. Most viruses have a protein coat called a capsid. The capsid will not take up either the crystal violet or the safranin of a Gram stain.
The answer to whether HIV gram-stain positive or negative is that HIV gram-stain is negative. They retain the light red or pink color after the stain.
There is no Gram stain for the rabies virus - it does not pick up either the stain or the counter-stain and has no official Gram stain status like bacteria do. When scientists are looking at slides of brains to see if an animal was infected with rabies, they use a special immunofluorescent stain made of antibodies against the rabies virus linked to either a vividly colored pigment or a fluorescent pigment. If the rabies virus is present, the antibodies in the stain adhere to the viral particles and then the pigment becomes fixed to the tissue as well, allowing the pathologist to "see" the virus (actually just that the virus is present and approximately where it is at - the virus is too small to see with a standard light microscope).
The scientific name for Rubella virus is Rubella virus, which belongs to the Rubivirus genus in the Togaviridae family.
Gram-positive and gram-negative refer to the Gram stain used to prepare slides of bacteria for viewing under a light microscope. Viruses are too small to see under a light microscope and have to be prepared differently for viewing under an electron microscope. So the answer to your question is neither
A gram stain is a cow
Rubella is a disease caused by the rubella virus. The name "rubella" is derived from the Latin, meaning "little red."
Rubella is an infection, that can be transmitted by inhaling droplets that get into the air when an infected person coughs, sneezes, or talks. Rubella can also spread by direct contact with fluids from the nose or throat of an infected person.